YOTOM Rv Level Bubble is made of quality ABS plastic that are extremely durable and can withstand outdoor conditions including rain, sunlight and temperature changes; The gauge monitors tilt from -7 to 7 degrees, Markings indicate number of inches required to raise or lower trailer or vehicle, and bubble rides in damping fluid for smooth to provides precise leveling information to ensure your RV is balanced; Easy to Install: Each Trailer Bubble Level comes with a strong adhesive backing that allows for easy and secure attachment to various surfaces, you can also install it with screws; Bubble level is suitable for RVs, campers, travel trailers, 5th wheel, tractor, truck, car, boat, or any vehicle that tilts, it can be mounted on the inside or outside of RV, camper, or popup trailer. RV Leveler, Utility Trailer Bubble Level, Leveling System for RV, Camper Trailer, Features Graduated Markings for Easy RV Leveling