Designed to read in actual pounds of weight on your air suspension system for tractor or trailer, to the nearest 100 Lbs. Easy to install and calibrate. After calibration the gauge will display actual load weight in lbs on the axles it has been calibrated to. There is a delay button so you can set the gauge to update every 1 sec for loading or every 60 sec for driving so the display will not Jump around. The Picture to the right displays 33.0 = 33,000 lbs. There are two modes WEIGHT or PRESSURE . Mounts in a standard 2 1/16" hole. Automatic Display Brightness Control. NOW available in Kilograms (kg).ALSO available for 2006 and Newer Kenworth and Peterbilt trucks. Requires a 1/4" air line.