Magnetic Design: This level is magnetic and can be attached to the steel surface of the RV or trailer for measurement, which is very convenient Waterproof and Durable: Made of durable ABS material,it has a long service life even in bad weather outdoor-great for camping accessories Mini Size: Small size bubble T-level can be permanently mounted to various places in rv trailer motorhome. Carry in a tool bag, pop in a pocket for climbing a ladder, anywhere you need a cross-check level. (Note: when mounting with screws, don’t screw too tight as to warp the level body.) Easy to Use: Each level is 58mm by 42mm wide containing two liquid filled vials mounted to frame backing with 2 screw holes for use in mounting or apply adhesive to mount.Or magnetic adsorption on iron, free of screw fixation. Widely Applicaiton: This T level is useful to attach to ping pong tables and pool tables for accurate level play. These T Bubble Level can be used for leveling RV or items in your rv trailers, and level many things in rv motorhome, such as level rv refrigerator, help trailers or camper to check for the levelness. T-type bubble spirit level also used for leveling machine, workshop,construct, woodwork, leveling cameras, telescopes or other tripod mounted devices etc