It is accurate to within +/- 1-2lbs. Hence it may not be fool-proof but does provide a more reliable reading compared to the previous guess-o-matic methodology!
True ... it can only measure up to a maximum of 42lbs but that is more than sufficient for determining the tension of a badminton stringbed at this point in time.
How do you use it?
Firstly center the device to zero before you start.
It has the following on the back of the device.
Place the 2 metal extensions to a cross-point as per in the above pix. The device will be at about a 45-degree angle in the North-East direction aka in the middle between 10-11 o'clock.
Then turn the dial clockwise until the meter shows noon or in-parallel to the string area to be measure - please see pix below.
Recommended places to perform the measurement are as shown below.
Hope the following vide0 explains better...
