Tohnichi Adjustable Torque Screwdriver RTD20Z (6~20 in.ozf) Review

Tohnichi Adjustable Torque Screwdriver RTD20Z (6~20 in.ozf) Reviewhttp://tinyurl.com/pwwunnh Tohnichi Adjustable Torque Screwdriver RTD20Z (6~20 in.ozf) Adjustable torque setting by twisting shaft with main and supplementary scales. For Clockwise tightening onlyLock ring holds selected torque value in place and a click alerts user that torque set has been achievedRotary slip mechanism prevents over torque by ratcheting after click. Accuracy +/-3% of indicated valueAccepts 1/4 hex bits (not included)Includes Certificate of Calibration (NIST Traceable Cert offered for additional fee)