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7-Function Digital Multimeter

7-Function Digital Multimeter

Item # BTMT15
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Digital multimeter (DVOM) measures AC and DC voltage, amperage and ohms. The easy-to-read LCD screen provides accurate data. Test leads and battery included. Lowest Prices for the best wiring from Buffalo Tools. 7-Function Digital Multimeter part number BTMT15 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Buffalo Tools Wiring - BTMT15

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Digital multimeter (DVOM) measures AC and DC voltage, amperage and ohms. The easy-to-read LCD screen provides accurate data. Test leads and battery included.


  • Measures AC/DC voltage (volts), current (amps), resistance (ohms) and continuity
    • Works as a circuit tester and electrical troubleshooting device
  • Easy-to-read, digital LCD screen
  • Test leads and battery included

MT15 Buffalo Tools Seven-Function Multimeter

Video of 7-Function Digital Multimeter

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

Video Transcript for Buffalo Tools Wiring - Tools for Wiring - BTMT15 Review

Today we're going to review part number BTMT15. This is the Buffalo Tools 7 Function Digital Multimeter. It comes with everything shown on the table here, comes with the pointed probe test leads in red and black, comes with a nice set of detailed instructions showing you how to test it and it comes with the nice multimeter that includes the battery. It is even fuse protected. The fuse and the battery you can access by removing those 2 screws. Basically this digital multimeter works as a circuit tester and an electrical trouble shooting device.

It has a nice, easy to read digital LCD screen. Using these probes that you plug in, I'll show you where they plug in. But, just to show you these charts right here, basically what you can be testing, is you can test AC voltage over here on this range, DC voltage over here. You can test DC amperage right over here. You can test Ohms, which is the resistance, down here.

That one is for diodes and the other little section is for transistors. There's a wide range of testing you can do. When you go to test it, the black test lead would be your ground. That would be your bottom one that says COM common, which is common ground. It also shows the little ground symbol. Just push that in.

Then the red one, you'd hook to whatever you're going to be testing. The middle one would be volts and resistance Ohms and the top one would be your amperage testing. If you want to test the voltage, you just push it into the middle one. Make sure they're pushed in all the way. Then using your pointed probes, you can touch whatever you want to test it. You do have to turn it on.

You turn it to whatever diagram you want. If you want to do DC voltage, you turn it over to there and you can see a nice readout. If you turn it AC voltage over here and then DC amperage right over in here. As I mentioned, down in here this area is for your Ohms, measures in Ohms, and that's for your resistant test. Then always make sure you put it in the off position to save on the battery. That should do it for the review on part number BTMT15. This is the Buffalo Tools 7 Function Digital Multimeter. .

Customer Reviews

7-Function Digital Multimeter - BTMT15

Average Customer Rating:  4.4 out of 5 stars   (9 Customer Reviews)

Digital multimeter (DVOM) measures AC and DC voltage, amperage and ohms. The easy-to-read LCD screen provides accurate data. Test leads and battery included.

- BTMT15

Every thing worked out very good 845018

- BTMT15

It does what is supposed to do. Buy it 749552

- BTMT15

The very 1st test the red lead that you check the power with fell off. 455144

- BTMT15

arrived promptly 444817

- BTMT15

As stated, this item will not test AC amperage....But, it is an excellent tool and, an excellent bargain otherwise....Prompt delivery - well boxed. 360880

- BTMT15

Never had a meter that measured D.C. Amps in series. It's good to have one around when I need it. Works great on trailer brake magnets. 310220

- BTMT15

Works as advertised, no complaints, easy to use. Cannot beat it for the cost. 186153

- BTMT15

Much more than I expected for the price 115841

- BTMT15

Good value. Speedy service. Thanks. 95180


Ask the Experts about this Buffalo Tools Wiring

  • What Is The Voltage For A Vent Fan Replacement For Keystone Montana 5th Wheel
    You're going to want to use a multimeter like the # BTMT15 which will show exactly what the voltage is on the output wire of the vent fan. If the fan is powered by a battery then it's a 12 volt. Most units inside of vehicles use 12 volts. Most units inside of homes use 120 volts. Another way to ensure you're picking the correct voltage for your Keystone Montana 5th Wheel Trailer is to confirm with your trailer's owners manual.
    view full answer...
  • How to Test Brake Magnets on a Dexter 7,000 Lb Axle
    I have attached a help article that will walk you through step by step the various processes to troubleshoot brake magnets. In order to perform these tasks you are going to need a multimeter like part # BTMT15 instead of a test light like part # 40376. Then depending on where the problem originates, you can use part # 10-1-1 if you need to replace any of the wires and part # BP01-225 if you need to replace any of the magnets.
    view full answer...
  • How to Bench Test Electric Trailer Brake Assemblies and Magnets
    Testing your trailer brakes for proper function on the test bench will require a multimeter that can display readings for both amps and ohms, such as part # BTMT15. (Some brake controllers, such as the Tekonsha P3, have built-in test functions.) You will also need a 12V battery. Please refer to the linked article concerning the testing procedures for electric trailer brakes. This article includes a table of the correct current values you should read for various sizes and numbers of...
    view full answer...
  • Equipment for Testing Trailer Wiring and Brake Magnets
    There is not a specific product we carry which tests electric brakes, but if you are looking for something that will test trailer brake magnets you would want to use Multimeter # ALL648349; I have added a help article on testing brake magnets for you to take a look at. You may be interested in the Hopkins Tow Doctor Trailer End Test Unit # HM50928. This kit will allow you to test all trailer wiring functions with adapters that will work with 7-way, 4-flat and 6-round. It will even indicate...
    view full answer...
  • Troubleshooting Lippert Ground Control 2.0 Leveling System Error Code
    There are a couple of things as I talked with my contact at Lippert. You will need to follow this system perfectly of the error will not clear. You need to extend the front jacks 6 inches, then the rear jacks 6 inches, and then press and hold the retract button until the jacks are all retracted. This should clear the error. If it does not, then use a multimeter like # BTMT15 check to make sure that left front jack is getting the proper battery voltage. If it is under 12V then it...
    view full answer...
  • How To Troubleshoot Electric Trailer Brake Magnets
    I have attached a helpful article that explains 4 methods for testing your electric brake magnets. You will need a multimeter like part # BTMT15 to check the amperage when testing the magnets. The article explains how to test the magnets while the trailer is connected to the vehicle and also explains how to do bench testing to see if the magnets are working properly or need to be replaced.
    view full answer...
  • What is the Maximum Amperage Draw Rating for a 7-Way Trailer Connector
    The reverse light circuit on most vehicles usually have a max amperage draw of around 5 amps. The amperage is usually limited by the gauge of the wire used on the circuit. The recommended wire size for the reverse light pin on the Pollak Black Plastic, 7-Pole part # PK12-707E is a 14 gauge wire. The maximum amperage that can be ran through a 14 gauge wire safely is 15 amps.
    view full answer...
  • Troubleshooting Electric Trailer Brake Wiring Voltage Issues
    It sounds like you have replaced your brake assemblies and still are experiencing issues due to wiring. I recommend first using your meter like # BTMT15 or circuit tester like # PTW2993 on your 7-way on the 5 o'clock pin. That is the pin from your brake controller. Using the manual override on your brake controller you should be getting 12V power on that brake controller output pin. If you are not seeing the gradual increase when hitting your manual override on your controller, there...
    view full answer...
  • Troubleshooting Uneven Braking on Sides of Trailer That Switches Sides with New Brake Assemblies
    You do have a very interesting situation on your hands. It would make more sense for you to have the same problem on the same side but the fact that it jumped from one side to the other leads me to believe that it is a wiring issue. Start off by checking the grounds for your brakes. Make sure they are secure and connected to a clean, bare-metal surface. If those look good then check the other wiring that is surrounding your brakes. If you have a jumper wire that runs along your axle...
    view full answer...
  • Weak Voltage on Right Hand Trailer Turn Signal Circuit
    The next set of troubleshooting steps for you are going to require access to a multimeter like part # BTMT15. Once you obtain the multimeter you are going to want to test the right turn signal circuit at the trailer connector on the vehicle and compare that to the left turn signal circuit. If there is a drop in voltage present you will need to do the same thing but at the back of the trailer connector. If no drop in voltage is detected then the trailer connector will need to be replaced....
    view full answer...
  • Troubleshooting Tekonsha Prodigy Brake Controller With Drag At Setting B3
    The button on the right on the Tekonsha Prodigy is the Boost button. The boost levels are pre-set based on how much the trailer weighs in comparison to the tow vehicle. For example, by pressing the button once, it will display what the current boost level is. If you see ".c" that means the boost is off. If you see ".c." (with the second dot) that means it is on. Every press of the button changes the boost level up to b.3. A boost setting of b.1 is for trailers that weigh less than the...
    view full answer...
  • Brake Controller Not Sending a Full 12 Volts with Brake Pedal
    My first question would be which brake controller do you have installed? If it is a proportional brake controller then this is not uncommon as a proportional brake controller senses inertia from the tow vehicle and then as the name states, applies that proportion of braking power to the brakes on the trailer. Since you are sitting still while testing, the full braking power will not be sent to the trailer with only the brake pedal depressed. However, in order to make sure there are no...
    view full answer...
  • Troubleshooting Weak Trailer Brakes
    There are numerous potential issues here with your trailer brakes being weak, and one thing that may be the issue is that you have a weak ground. I say that because a weak ground would explain why the amperage to the brake magnets is almost certainly not getting through. You also definitely want to test your magnets for the proper voltage with Multimeter # BTMT15. I have added a link to a help article on how to properly test brake magnets which I highly recommend taking a look at. In...
    view full answer...
  • Troubleshooting Brake Force Brake Controller Not Functioning
    The issue could possibly be the brake controller or it could be the wiring of the overall setup. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # PTW2993, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output wire properly, try the brake...
    view full answer...
  • Troubleshooting Output Shorted No Brakes Message on Tekonsha P3 Brake Controller
    It does sound like there is a possible short with the brake magnets on your trailer, especially if all the wiring looks good between the brake controller and vehicle connector. I recommend first making sure that each magnet has one wire secured to the trailer frame for ground and the other is connected to the brake output circuit. Check that there are no damaged or exposed areas that might be making contact to the trailer frame. If the wires all check out, then you will want to test...
    view full answer...
  • Trailer Lights Only Work When Door is Open on 2011 F-150
    You must be somehow tied into the illumination circuit on what I assume is a factory harness on your 2011 Ford F-150. What you should do is start by testing your harness with Multimeter # BTMT15 to see if it is getting 12 volts when the door is open, which will verify that it is indeed tied into that circuit. Since it is a factory harness you are going to need to go to your local Ford dealer to have them examine exactly how this issue came to be, as this is a first and strange is certainly...
    view full answer...
  • Troubleshooting Trailer Brakes Getting Only 8 Volts Of Power
    If you are only getting the 8 volts when you pull the pin using a meter like # BTMT15, that has nothing to do with your brake controller as the breakaway battery is powering that from the trailer itself. You can confirm your brake controller is working properly by checking the 5 o'clock pin on your 7 way with your meter when the trailer is disconnected while having someone hit the manual override on your brake controller. You most likely have a bad ground in your wiring on your trailer....
    view full answer...
  • Testing Brake Magnets on Trailer
    We actually have a great article on exactly this subject, which I have linked below. To test the individual brake magnets on the trailer you will need to use a multimeter like # BTMT15 that reads amps and ohms. You will sever the magnet wires and connect the multimeter between the positive post of a 12V battery and one of the wires (it doesn't matter which one). Then connect the other magnet wire to the negative battery terminal. If the amperage is more or less than it should be (see...
    view full answer...
  • Should There be Continuity with the Brake Controller and Ground Pins on a Vehicle 7-Way Connector
    Yes, when your brake controller is sending power back to your 7-Way connector you should have continuity with a Multimeter # BTMT15 between that and the ground pin. To ensure that you are sending power back to the brake controller pin set your brake controller to the highest setting and then have someone use the manual override. This will allow you to check for continuity. If you don't have continuity then that means something is wrong with either your brake controller or ground wiring. Let...
    view full answer...
  • One Side Of The Trailers Electric Brakes Are Locking Up
    The first thing you will need to do is ensure the breakaway pin is attached and the battery is fully charged. If you do not have a breakaway kit or the pin is still attached, please disregard. It sounds to me like the left side of your trailer's electric brakes are short circuiting. In order to test this, you will need a multimeter such as the 7-Function Digital Multimeter part # BTMT15 and a circuit tester like part # 40376. You will first want to test each of the wires at the back...
    view full answer...
  • Testing To See If Brake Magnets Are Bad
    It is not normal to have 12 volts on both wires of your magnet. One side should be hot and the other should be ground. I recommend checking your magnets for amperage using a multimeter like # BTMT15. I've attached an article on how to use this meter to test your brake magnets. If you find that the magnets are bad, I recommend # BP01-180 for 12 inch assemblies and # AKBRKR-M10 for 10 inch assemblies.
    view full answer...
  • Potential Causes for Overheating Trailer Brake Drums
    Trailer breakaway batteries are usually rated for 5-amp-hours and are designed to keep your four brake assemblies engaged for 15-minutes in the event of an accidental disconnect. The only way the breakaway battery could heat up your drums is if it kept the brakes engaged as you drove. In the same way, if there were a short in the vehicle or trailer wiring that somehow let your 12V power feed reach the brake circuit, which would also keep the brakes engaged. Either way you would probably...
    view full answer...
  • Getting Power To Trailer Brakes But Brakes Not Activating on 2010 322 Toy Hauler
    There are a few things that could be causing the problem you are having with your trailer brakes. First, you will want to check the adjustment to your brake assemblies. When turning the trailer wheel, you should be able to hear the brakes barely brushing all around as the wheel spins. If that is not the case you will want to adjust the brakes by accessing the adjustment gear on the back of the brakes (see video link). You will want to tighten up this gear until you cannot easily spin the...
    view full answer...
  • No Power To Trailer Brakes When Using Manual Slide Switch on Hayes Brake Controller
    The brake controller should be getting 12 volts of power through the Black wire. You will want to use a multimeter like part # BTMT15 to test this wire for voltage. The Blue wire should have near 12 volts when the manual slide is activated. You will also want to make sure the gain on the brake controller is not set all the way down. If you are not getting power leaving the Blue wire, the brake controller may be bad and will need to be replaced. I would begin by making sure you have the...
    view full answer...
  • How to Test Brake Magnet Amperage With Multimeter
    You are correct, the BTMT15 is only designed to measure up to 10A which will not allow you to measure for 4 or 6 brake magnets on a trailer. In this case I would recommend using a multimeter with a higher amperage rating or testing the magnets separately. At this time we do not carry a multimeter capable of testing more than 10A. The next section of our brake magnet testing article details how to test each magnet separately to determine if one or more of the brake magnets on your trailer...
    view full answer...
  • Electric Brake Magnet Troubleshooting and Testing
    You are correct that the amps and voltage are not the same. If you put your multi-meter like # BTMT15 between a spliced brake output wire on your vehicle between the brake controller and the trailer connector socket with your trailer connected to your vehicle, you should get an amperage reading of 7.5 to 8.2 amps for a single axle trailer, 15.0 to 16.3 amps for a tandem axle trailer, or 22.6 to 24.5 amps on a triple axle trailer. If the amperage reading is less then the specified amounts...
    view full answer...
  • Troubleshooting Heating Element on Water Heater
    To test your heating element you will need a multimeter like # BTMT15. You will set your meter to the lowest ohm setting and put one probe on each of the screws on the heating element. You should get something between 10 and 16 ohms. When one is all rusted or corroded you would get no reading to show there is no continuity and it would most likely throw your breaker. Since your water is really cold, you most likely have a failed heating element and will need to replace it.
    view full answer...
  • Troubleshooting Non-Functioning Motorized Stabilizer Jacks on 2011 Keystone Sprinter 276RLS
    If suddenly neither switch/jack operates at all on your 2011 Keystone Sprinter 276RLS travel trailer I would suspect the battery or the 12V connections between it and the jacks. Motorized jacks and slide-outs will demand far more current than things like trailer lights so your battery could have plenty of charge left to operate those things but still have too low a charge to activate jack motors. Jacks will use more power to lift trailer weight than to lower it. This is why sometimes...
    view full answer...
  • Primus Brake Controller Side Lever Adjustment and Light Staying On All of the Time
    It sounds as if you have a Tekonsha Primus brake controller without the boost function built in. Your controller should have a power adjustment wheel on the left side and a manual brake activation slide switch on the right side. If there is a lever on the side it is most likely a leveling lever that needs to be set so that the sensor in the controller is level and will supply the proper voltage with deceleration of the vehicle. The lever for leveling the brake controller is normally...
    view full answer...
  • Troubleshooting a Tekonsha Voyager Brake Controller That is not Recognizing Trailer Connection
    There may be a chance that your brake controller has malfunctioned and may need to be replaced. To make sure I have attached an article that will explain how to test the brake controller. To check the output voltage at the rear of the control, cut the Blue wire 5-6 inches behind the control. Install the test light between a known good chassis ground and the Blue wire coming out of the control. Apply manual slide fully; using the volt meter like # BTMT15, measure the voltage from the...
    view full answer...

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