Using this Wera torque wrench is simple. First, decide whether you need clockwise or anti - clockwise torque control. You can change the direction with the captive 3/4' square head insert. Then, set your desired torque value in the 20 - 100 Nm range. You'll get audible and tactile clicks as you reach the scale values to help you set it accurately. When you're using it, keep an eye on the release mechanism. Once the set torque is reached, you'll hear and feel a clear signal. For maintenance, keep it clean and dry. Don't expose it to extreme temperatures or moisture. If you notice any damage, stop using it and have it checked. Always follow the torque specifications for the task at hand to ensure safe and effective use.