As the industry's original "no scale load scale," your truck and/or trailer weight is clearly displayed via the AppWeigh app on your smart phone or tablet within range of the Bluetooth enabled sensors. With our advanced sensors using the latest Bluetooth technology, our 2-point calibrated weight system is accurate to within 300lbs or better. AppWeigh's long-lasting, all-conditions battery means no wiring is needed for installation (simply attach the sensor to air suspension by inserting the included tee fitting). By eliminating the unnecessary hardware of outdated analog and digital onboard scales, AppWeigh offers the fastest return on investment (ROI) of any Smart scale. No subscription required!