Accuracy ±1% (clockwise and counter-clockwise). Resolution 0.1N.m. Square socket(L) 3/4". With external sensor, to test torque wrenches, torque screwdrivers and other torque tools. Clockwise and counter-clockwise operation. Peak and track working modes. Unit: N.m, in.lb,kg.cm. Target torque value can be set (9 target torque values can be saved and selected quickly), with audible and visible alarm: green LED light on and buzzer sounds when the value is 90%~100% of target torque, both green and red LED light on and buzzer sounds when the target torque value is reached. Memory of 250 measurement values for browsing and output. Power off in 5 minutes automatically.