Torque checker helps keep your screwdrivers’ torque properly tuned. Stores up to 800 measurements, even after the power is turned off. Energy saving AUTO POWER OFF function engages after being unused for 10 minutes. Verified torque accuracy of +/- 0.5 %. Measures both clockwise and counterclockwise. 4 digit digital display. Measurement range: 1.3 - 88.5 lbf/in.