From the Manufacturer Proxxon 23353 MICRO-Click 200/S Torque Wrench 1/2 inch square drive to DIN 3120 (German Industrial Norm) is convertible for left-hand threads. The 200/S Torque Wrench is good for torques from 40 to 200 Nm (Newton meters). Has large, legible scale of exact adjustment of desired torque by turning knurled adjustment ring on end of handle. Push in ring to lock in position. Ratchet mechanism has reversing lever for changing ratchet mechanism. Also features automatic quick release that is clearly audible with perceptible "click" upon reaching set torque. Very high accuracy plus or minus 3 percent. Proxxon Torque Wrench 23353 comes with a sturdy blow molded storage case to protect Proxxon German quality industrial precision tool.