First of all... I love Tennis Point! Great experience with them! As far as the Gamma String calibrator it works as advertised and had no issues. You have to look up how to use.. Just Google it

Excellent tool for stringers and those who own stringing machines but overpriced.

easy to use. poundage a little hard to read.

seems to work fine...don't have anyway to confirm results...i believe gamma produces trustworthy products and the calibrator is one of them

I like this detailed measurement calibrator. Allows me to keep my machine pulling accurate tension.

It is very affordable one, but works well.

My confidence to string racquets has gone to a higher and professional level with the use of the Gamma Stringing Machine Calibrator. This is a must have tool for any stringer.