HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth

HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth

Item # HG103

lowest price pledge

Our Price: $99.00


This item qualifies for Free Shipping

Shipping Weight: 0.5 lbs

In Stock, Ships Today
Haul Gauge Tongue Weight Scale Tools - HG103
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
Please enter a valid email address.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

pop out icon replay 360 icon
horizontal rotate icon

Product Images

In Use/Installed


  • Hitch Tools
  • Measuring Devices
  • Tongue Weight Scale
  • Haul Gauge
Wirelessly connects to your smartphone and allows you to quickly and easily measure tongue weight, pin weight, payload, and gross combined weight. Just plug it into the OBD-II port on your vehicle and after calibration you are ready to go. Lowest Prices for the best tools from Haul Gauge. HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth part number HG103 can be ordered online at etrailer.com or call 800-298-8924 for expert service.

  • All Info
  • Reviews (3)
  • Q & A (5)
  • Videos (1)
  • Photos
  • Why etrailer?

Haul Gauge Tools - HG103

Wirelessly connects to your smartphone and allows you to quickly and easily measure tongue weight, pin weight, payload, and gross combined weight. Just plug it into the OBD-II port on your vehicle and after calibration you are ready to go.


  • Unit lets you know if you need to adjust your load before you tow or haul
    • Measures tongue weight, pin weight, payload, and gross combined weight
    • Promotes safe towing
    • Eliminates the need for separate or commercial scales
  • Wireless system connects via Bluetooth to your smart device for operation
    • View weight information through mobile app on your smartphone
  • Fast, plug-and-play installation makes setup a breeze - no tools required
    • Plug unit into the OBD-II port on your vehicle
    • Download free app on your phone and then calibrate


  • Application: vehicles 1996 and newer
  • Smart device OS requirements:
    • Apple (iOS): 10.3 or higher
    • Android: 5.0 Lollipop and higher, Bluetooth enabled
  • 1-Year limited warranty

HG103 Haul Gauge Wireless Trailer Tongue Weight Scale, Payload and Pin Weight Scale

Video of HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Haul Gauge OBD II Mobile Tongue Weight and Payload Scale Review

Hi there expert haulers. Today we're going to be taking a look at HaulGauge's tow safe vehicle and trailer weighing system. And this is it right here. It simply plugs into the OBD2 port found on all vehicles made 1996 and newer. And it's located typically underneath the dash below the steering wheel, where you plug it in and connect the app on our phone to it and we're ready to go. We can measure our tongue weight, the payload that's in the back of our truck.

We can set up our weight distribution system to determine how much weights on each axle. As well as determining how much the overall weight of our vehicle and what we're hauling is.Now you're probably wondering, well how does this little device do that Well there's a lot of complex measuring devices inside here. We're going to go over those and how they operate, calculate the weights at various aspects of your towing needs.Now while this does work on anything that's '96 and newer, like our 2001 Ranger over there. Anything that's 2008 and newer most likely has a calibration that's already stored inside here. So when you plug it in, it pulls your VIN and it already knows all the calibration information that it needs to make the correct calculations for all the weight that it's going to be measuring.

For things that are older than 2008, you will likely have to enter your VIN manually and also do a manual calibration process to get it all set up.We've got our boat here we're going to be hauling with our Ranger. Let's go ahead and measure the tongue weight. We'll begin by positioning the tongue of our trailer over our ball at the back of our truck and we're going to go ahead and hit the ready button. Okay, we can see here that we're currently at zero. So we're going to go ahead and lower down our tongue onto our ball and we're going to see how our measurements change.

And we want to make sure that our jack is completely off the ground, so all the weight of the tongue of our trailer is on our hitch ball.And you can see here that our scale is now measuring and we're sitting at around 300 pounds. You want to keep in mind that there is a slight deviation plus or minus about five percent. And that's pretty standard for just about all measuring devices.Now you don't have to use this to measure the tongue weight on your trailer. It can be used to measure all kinds of tongue weight. Whether you're using your SUV with a cargo carrier or bike rack and you got it loaded up.

You want to verify that you're not exceeding any of the weight limits on your vehicle or your hitch.For comparison we've got our Sherline tongue weight scale. You can also pick up here at etrailer.com. And it's measuring about 300 pounds. So as you can see they're both pretty accurate within one another. And this is here is a tried and true unit, that's got a good reputation of being an accurate scale for many years.Next we'll check out our payload weight. We've got some extra weight here we're going to be adding to our truck bed. I've gone ahead and pulled up payload in the app, zeroed it out by hitting ready and we'll get our extra weight in the back of the truck. We've got about seven coworkers in the back of the truck and you can see here we're reading about 1,000 pounds. Which is pretty accurate for what we have in the back. And now that everybody's exited the back of the truck, we're back down to zero.Now this could have easily been mulch or rock, and this way you can verify that you're not overloading the bed of your truck. In order for the HaulGauge to determine the total weight of both our truck and what we're hauling, our boat here. We're going to have to do some driving. So let's hop in and go for a drive.You can see here we're going to have to drive the vehicle due to an outline of what we're going to do. We're going to be driving it. We're going to start from a complete stop. We're going to go in a straight line. We're going to accelerate with half throttle up to about 15 miles an hour. And here you can see we're measuring in just a little bit under 10,000 pounds. And that's about accurate. Our truck weighs in at a little over 5,000 pounds, so the weight of our trailer plus our boat on it is making up that difference, bringing us close to 10,000 pounds.And now you're probably wondering, well why is this important Well this gives you the complete weight of your vehicle plus whatever you're hauling behind it. So all you have to do then is subtract the weight of your vehicle, which is written on the inside of your doorjamb and all you're left with is what you're hauling plus the weight of the passengers inside of the vehicle. This way you can ensure that you're not exceeding any of the towing capacities on your vehicle.You'll also know that you're not going to be exceeding any of the weight ratings on your towing components, such as your hitch, if you have a drop or rise. All those have weight ratings and you want to make sure you don't exceed them. Additionally, you know the weight of the entire vehicle together, which can be important when going over certain bridges that have weight restrictions on that bridge. You have your collective weight of your entire assembly and you'll know whether or not you're going to be safe crossing that bridge or not.Now there's a couple other measurements that you can take with the app. You can measure your pin weight, which is going to be for your fifth wheel trailers and your gooseneck trailers. So you can measure that right on top of the axle. It just helps recalibrate the system. So instead of checking for the weight of the tongue at the back of your hitch, it's checking for it over the axle where you have it on a fifth wheel or gooseneck. This is just going to make it more accurate and it's going to provide you with the same information that you would want to know to ensure you're not exceeding your tongue weight or pin weight capacities.For the weight distribution measurement, you'll receive two weights. The weight that's on your rear axle and the weight that's on your front axle. And this way you can use your weight distribution system to redistribute that weight and level it out. Now that's what a weight distribution does, but this way you can verify it with the app and determine that you've got it in the most distributed position possible, by verifying it's the same both front and rear. And there's a bunch of benefits by having your vehicle have its weight evenly distributed across both axles.It's going to help improve your handling by restoring that lost performance you had from lifting up on the front end. It's going to restore lost braking performance for similar reasons. It's going to be able to distribute the weight properly for your front brakes to dig in like they're supposed to. It's also going to help increase tire wear because your geometry or suspension is not going to be off wearing your tires more. There's a just a whole slew of things that it's going to help out with. And this will help you be accurate as possible.Many people want to know, well hey is this system going to be accurate and work with my auto leveling factory set up or the airbags that I've got installed on my truck And the short answer is yes. There are some stipulations like your airbags before you load up your vehicle. You want to make sure that you've got it at the lowest setting, which is typically about five to 10 psi. Then you load it up, get your measurement, and then you can air up your bags after you've taken your measurements. For your auto leveling, you simply just turn that off your cluster before you take your measurements. Then you can turn it back on after you're finished taking your measurements.Another thing people wonder is, will this work with my manual transmission on my truck And that is a bit of a mixed yes and no. The tongue weight, weight distribution, payload features, and your kingpin features, those will all work. It's still going to be able to determine the weight of those things loading down the back of your truck or your SUV. Now when it comes to the weight of the entire vehicle plus with what you're hauling, that feature will not work with a manual transmission. We've talked about before how the OBD device here is able to pull information from the modules on the vehicle. And part of the information it uses is slippage from the automatic transmission, since it doesn't have that with a manual. It cannot make the proper calculations for the complete weight. You won't even be able to calibrate that if you do have a manual transmission. But those other four features, which are some really big ones will still work just fine.People also wonder, will this work if I'm not on level ground or if I'm offroading And the short answer is yes. But if you're on a grade that's steeper than five percent, the measurements will be ignored until you get to a more level area, where it will then take the measurement. It's always recommended though to be on level ground to get the most accurate readings.Now some people are wondering, can I use this when I have other things plugged into my OBD port such as a tuner or an insurance tracker. And the short answer really is kind of no. You would have to purchase a splitter and the device would need to be mounted properly in order for it work properly. The best way to use it would be to plug it in, take your readings. And then if you have a tuner or an insurance recorder that you want to use, simply unplug your HaulGauge once you've finished taking your measurements, plug in your other devices and then go on continue your travels.Now for those of you with a lifted truck, you're probably wondering hey is this going to work properly with my truck The answer is yes, but it's going to be a little bit more set up. You won't be able to just use the VIN number to pull a calibration for your vehicle. You are going to have to go through the manual calibration. So that way it's calibrated for your specific suspension enhancements that you have on it.Customers are also wondering if they can get a digital readout on their app instead of the analog gauge that's displayed. And the answer is no. You are going to be stuck with the analog gauge here. But there's a reason for that and that's due to typical gauge accuracies are within about plus or minus five percent. So rather than give you a specific number, the needled gauge it's going to give you a relative idea. It's going to be closer to what the actual measurement is. And we already verified that it's pretty accurate when we compared it to our Sherline gauge. Speaking of the app, it will only work with newer Apple or Android phones. It will not function correctly with iPads or other tablet devices. You may be able to download the app and get some functionality out of it. But there is some issues with it working on those at this time.If you're wondering if your tow haul mode is going to affect its use while you're using it. You don't have to worry about that because the majority of the measurements that are taken are done below 10 miles an hour, which the strategy that your tow haul mode is going to implement on your vehicle isn't really going to affect it at such a low speed. So it's going to work just fine.Now this is my first time using the HaulGauge. I got to say I'm genuinely impressed. It worked very easily. It plugs in, the app is very user friendly to work with, easily describing all the steps that are necessary to take the measurements. And you get a lot more than you get out of just your typical tongue weight scale, like our Sherline. Yeah the Sherline's accurate, but you have to set it up, and you have to move your trailer around. It's kind of a hassle. With this, I just hook up my trailer like I was going to haul it normally and it takes the measurements. How easy can you getHere we'll show you how to get it set up on your 2008 newer vehicles. I've already downloaded the app on my phone. I'm going to insert the HaulGauge into my OBD port. Just under the dash here. I've opened the app here. You want to make sure you have Bluetooth on your phone turned on, as it points out here in step two. So we've got it plugged in. We've got Bluetooth on. We're going to search. It's able to find the device here, but it's asking us to turn the key on. We're going to go ahead and turn the key on.We'll go ahead and select it now. And here it pulls up a screen where you may have to enter it manually or you can scan the VIN. Sometimes it's able to pull the VIN, sometimes it's not. So we're just going to go ahead and click the scan button on the app. The app then uses the camera on your phone to scan the barcode. You can usually find the barcode located inside the doorjamb on a sticker here next to your VIN. Make sure you give the app permission to use the camera and then just aim your camera over the barcode. Give it a moment here. And then you'll be set on the menu.We're now inside of our older Ranger. We've got the HaulGauge plugged into the OBD port and we're going to get it set up to this one. This is an older vehicle, so it likely doesn't have calibrations available. It's going to go ahead and make us scan the VIN, just like I did on the other vehicle. I'm going to do that real quick. Now if the scan's complete and it's pulled up our VIN. You can see it comes to the same screen as it did on our newer vehicle. However, when we go to select the tongue weight, we have to perform a manual calibration. So we'll go and hit calibrate. Our engine is off. We'll go ahead and lower the tailgate on the back of the vehicle and we'll hit the next button at the bottom.Once we hit next, it pulls us up to the next screen where it instructs you to sit on the back of your tailgate, making sure that you're entirely off the ground. We've gone ahead and sent one of our fellow coworkers to sit on the back of the tailgate. He weighs about 150 pounds. So we're going to punch that in. And we'll hit our continue button. And now it's completed. The app was able to take the VIN number that we provided, so it knows what vehicle we're working with. We entered in the amount of weight that we placed in the back. It then took measurements using the accelerometers that are inside of the unit and was able to determine the suspension that our vehicle has and is now ready to measure our tongue weight.Once the calibration's complete from selecting the tongue weight. All of the options down here below: tongue weight, payload, weight distribution, and pin weight are ready. The weigh located here at the top does have a different calibration procedure that needs to be performed for it to operate. This will give you the total weight of your vehicle plus what you're hauling behind it. We'll go ahead and calibrate this too.You'll find your vehicle weight on the sticker located in the doorjamb. We'll then enter our max cargo weight. You'll find this on a separate sticker that's located in a similar location in your doorjamb. So we're going to go ahead and punch that in. We'll now put in the weight of the driver. So put my weight in there. Now we'll need to drive the vehicle around to complete the calibration set up.You'll want to lightly accelerate while driving in a straight line. Once you've done your light acceleration, it'll ask you to do a medium acceleration. And the next time it's going to ask you to do full acceleration. You'll need to repeat this process following the directions until it's completed here with your progress bar at the bottom. We're going to go ahead and finish this now.You'll want to make sure you do this in an area where it's free of traffic where you can do this multiple times until it completes it's calibration. An empty parking lot is a great place to do it. The whole process took about 10 minutes to go through the cycles and when you're complete, it'll tell you here on the screen. We'll just hit OK and we're now ready to go and it's prepared to weigh our vehicle, along with all the loads we have in either the back of the truck or on our trailer that we're pulling.Now you're probably wondering, well why did I do all that and what is starting and stopping do for me and how is it able to determine the weight Well it does this with a lot of different information that it's gathering. It's plugged into your OBD2 port, which allows it to communicate with all the modules that's in your vehicle. So it's going to be looking at engine load. It's going to be looking at your automatic transmission's clutch slippage. It's going to take that information to account along with the accelerometers that are inside the HaulGauge that determine when the vehicle dips down in the back, lifts in the front. And it uses all that in collaboration with your VIN, knowing what vehicle it is to determine how your suspension is reacting to the weight that's supplied on it. It can then use all that to calculate the weight that's applied in the bed of your truck or on your tongue of your hitch or in the back of your SUV.And now with everything calibrated, you're ready to start taking your measurements and get towing. And that completes our look at HaulGauge's tow safe vehicle and trailer weighing system.

Customer Reviews

HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth - HG103

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

Wirelessly connects to your smartphone and allows you to quickly and easily measure tongue weight, pin weight, payload, and gross combined weight. Just plug it into the OBD-II port on your vehicle and after calibration you are ready to go.

- HG103

So far I can only rate the purchase and shipping were both easy and fast. As well as the fact I have called twice with questions prior to install and got very quick and curtious answers both times. I have plugged it in and it recognized my truck and vin. Immediatley. I’ve yet to check truck weight and trailer weight etc. will be doing that this weekend and will doam update. So far, all good and a good value. A tounge weight scale by itself, doing nothing more, costs more than the haul hauge. Very pleased with my purchase so far. 648008

- HG103

Easy to install and use . Watched online tutorials prior to purchasing. Have not utilized all functions yet. 649911

- HG103

Product arrived with no package but was installed and worked good upon arrival. Thanks again for quick shipping and good transaction. 657165


Ask the Experts about this Haul Gauge Tools
Do you have a question about this Tool?

  • Is Curt MV Weight Distribution System Correct for 2019 Crossroads ZR18RK
  • The Curt MV Weight Distribution System # C17051 may be a great choice for your 2019 Crossroads ZR18RK but it will depend on a couple factors. In order to choose the best weight distribution system you will first need to know your total tongue weight (TTW), which is the tongue weight of your fully loaded and ready to go trailer plus the weight of any cargo behind the rear axle of your tow vehicle. According to my research your 2019 Crossroads ZR18RK has a GVWR of approximately 4,500...
    view full answer...

  • How Does HaulGauge Mobile Tongue Weight and Payload Scale Work?
  • The HaulGauge Mobile Tongue Weight and Payload Scale for OBD II - Bluetooth # HG103 simply reads your vehicle information and lets you know the parameters outlined by the manufacturer for safe towing of your specific vehicle. It then calculates weights based on force divided by acceleration. I've attached a photo to help with the manufacturer's explanation. HaulGauge measures weight by monitoring powertrain effort and vehicle acceleration. Powertrain effort is calculated from a torque...
    view full answer...

  • Will HaulGauge Mobile Tongue Weight Scale Work on Vehicle with Aftermarket Modifications
  • I reached out to my contact at HaulGauge regarding the Mobile Tongue Wight and Payload Scale # HG103 and he said the aftermarket suspension and larger-than-stock tires on your FJ Cruiser will not present any issues. The HaulGauge does plug into the OBD-II port to read vehicle data but it can be manually calibrated to account for aftermarket components like what you have. This will allow it to give you accurate readings based on your specific vehicle configuration. I have attached a...
    view full answer...

  • Will One Side of Reese Strait-Line be More Difficult to Connect
  • Yes, it is normal for one side of a Strait-Line system to be more difficult to put on than the other; attaching one side is going to create tension on the other side, so that would not be why your trailer is swaying a lot. The reason for that is almost certainly that you do not have the properly rated system. In order to choose the best weight distribution system you will first need to know your total tongue weight (TTW), which is the tongue weight of your fully loaded and ready to go...
    view full answer...

  • Can HaulGauge Mobile Tongue Weight Scale part # HG103 Be Used with Suspension Enhancement
  • Suspension enhancement like the Timbren kit you have installed on your 2019 Ford F-250 will affect the numbers of the Haulgauge # HG103. According to them a manual calibration would be required with this setup and that the Timbren would need to touch axle plus a set weight to calibrate. Here are the instructions they gave us for how to do this: HaulGauge measures pin weight using the pitch of the vehicle. Because your suspension is not stock, a short calibration will be required. To...
    view full answer...

Do you have a question about this Tool?

  • Why etrailer.com?

    At etrailer.com we guarantee:

  • Highest quality tools for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate tool information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Jacob T
Installed by:
Kathleen M
Video by:
Dustin K
Written by:
Kristina F

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.