This giant, 11" x 2-3/4" all-in-one RV level provides visual side-to-side and front-to-rear leveling assistance for trailers and 5th wheels. Level Master can be viewed from the driver's seat to help locate the best level location for parking your RV. Each mark on the side-to-side scale indicates one inch of blocking. The front-to-rear scale is adjustable and can be easily viewed while operating your tongue jack. This level comes with easy-to-install instructions on your trailer or 5th wheel and is backed up with a 1-year limited warranty.