LINDSTROM introduces a micro-adjustable torque driver with an easy-to-read window scale and a precise pull-to-adjust, push-to-lock adjustment knob. Offered in three models that covera torque range of 20 to 450 inch ounces with an accuracy of +/+6%. 1/4" Hex driver allows use of all standard drive bits(Phillips, Torx, etc.) Certificate of accuracy traceable to N.I.S.T. supplied with each dirver.