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The BetterWeigh™ mobile towing scale #51701 takes the guesswork out of towing and hauling, by measuring the real-time, live weights of your vehicle, trailer and more. BetterWeigh™ is a portable vehicle weight scale and trailer weight scale for the smartphone age. Powered by TowSense™ technology and equipped with Bluetooth, it provides safer towing and easier setup, all with virtually no installation requirements. Just plug it into the vehicle diagnostic port (OBD2). TowSense™ technology is a digital towing scale system. Using an accelerometer circuit, TowSense™ measures changes in the velocity and pitch of your vehicle. It uses this data to calculate weights associated with towing and hauling. Armed with TowSense™ technology, the BetterWeigh™ tongue weight scale wirelessly connects to your Apple or Android phone to display the weight of the vehicle, trailer, cargo / payload, tongue weight, pin weight, weight distribution and trailer brake gain. Newton’s Second Law of Motion states that force equals mass multiplied by acceleration. Force is determined by measuring slip across the torque converter as the vehicle accelerates. Acceleration is determined by an onboard accelerometer. BetterWeigh™ uses these properties to calculate the weight of your vehicle, trailer, cargo and more. With the unit calibrated, it can measure real-time weight while driving or at a standstill, and at any upward or downward grade.