It is hard to believe that s how this inexpensive tool is as accurate as the $675 Porsche tool, and very easy to use. Pressing this gauge against the serpentine belt will produce a torque-wrench click as a signal of the completed measurement. Swing indicator will show the corresponding tension in lbs. Or kgs. Porsche tool will show measurements in newton meters, when krickit tool will measure in lbs or kg. You must convert nm to lb. As the result, all 944 users should set their belt using 35 lb on timing belt and 35-40 on the balance shaft. If balance belt makes too much noise, set it to 35 lb.