The liquid in this level will not fade in the sun, so you'll always be able to read it. The large silver ball is easy to see from your rearview mirror as you level your trailer side to side. Use the small bubble level for front-to-back leveling.Features: Easy-to-see level helps you level your 5th-wheel trailer or travel trailer from the driver's seat when parking or adjusting landing gear Visible from your rearview mirror Two-way design