PROTO® electronic torque testers. Electronic torque tester with LCD screen and audible beeps. Main power with adapter. Features male 6-point 27 mm drive size. Accurate to +/- 1% CW and +/- 3% CCW digit accuracy. Measuring Units: ft-lbs, in-lbs and Nm. Operation modes include peak, hold and dial modes. Include blow mold case with AC/DC adapter and calibration certificate.