Right Weigh's 201-EBT-11B Bluetooth-Enabled exterior digital gauge is designed for straight trucks or tractors with an air suspension drive axle group with one height control valve, and a spring suspension steer axle. The drive axle group is monitored by a standard air pressure sensor while the steer axle is monitored by a spring suspension strain sensor that is epoxied and clamped to the top center of the axle. After both an empty and loaded calibration has been performed at a certified ground scale, the gauge will reliably display the on-the-ground axle group weight in pounds or kilograms. When properly calibrated and used, Right Weigh's on-board load scales are the most valuable tool available for maintaining safe and legal axle weights.