Fast, accurate and easy to use torque wrenches have accuracy +/-4% right hand (clockwise) and +/-6% left hand (counter clockwise). Reversible ratchet head features a 45-tooth ratchet design requiring only 8 degrees of hand travel for indexing. English and metric markings are color coded for easy reading. Ball bearing-mounted internal torque control mechanism provides proper lubrication, high accuracy, prolonged calibration life and consistent results. Positive, spring-loaded locking mechanism automatically locks in the selected reading to prevent accidental change. English Range: 10 to 100ft.-lb. (.5ft.-lb. grad.) Metric Range: 16.9 to 138.9 Nm (.7 Nm grad.) Length: 17.4"