Gamma Sports Racquet String Tension Tester (Tennis/Squash/Racquetball)

It has the utility of a $200 tension measuring instrument in that the measurement may not be accurate, but it will be consistent. It will return the same result ten, fifteen and twenty minutes from now. Its intended use is to help you decide when to replace your strings before they severely affect your game.It isn’t to check the accuracy of your stringing machine or your tennis shop stringer.That said, a week after I restrung my racquet to 55#, the Gamma STT measured 55#. An iPhone app said the tension was 36.3 lb. The racquet plays like 55#.

The only inconvenience was that after a few days, I had to glue back the string tension index label. I think that it is accurate.

It doesn’t show the tension strings were put at. One needs to make a graph to check the tension in order to see if it’s the time to restring.

Great product if you understand how to use it. It is not calibrated for exact tension; it will however provide you with accurate comparative readings. So with new string read the tension at racquet string locations noted in the instruction set (10-15). That is your basis for trend logging.

I just had my racquet restrung with Synthetic Gut at 52# by a professional stringer. I used this gauge on the new stringbed and it indicated very close to 52#. if you insert it into a square of strings that are close together, it's easier to get an accurate read. After reading all the 1 star reviews, I don't understand how they all had so much trouble. This gauge is not a professional instrument nor is it represented as one. When I turned the dial, I suppose I could have believed the tension to be anything between 50-52# - I knew mine was at 52#. But that is still pretty good for a $20 gauge. This will be a great tool to monitor the tension and replace the strings when they get below 45#.

Preface ; I am USPTA & PTR certified tennis professional with 40+ yrs experience stringing rackets. I thought the device would be able to reasonably estimate string tension while on court (professional testing machines are not portable), . Off by more than 10-20 lbs in most of my rackets, 3 of which I just strung.on a calibrated machine.The device to ascertain tension loss over time as a benchmark doesn't hold real value as while all strings lose tension over time and play with many variables interplay. this loss includes frame and string type, Elastic properties of a given string type have more to do with whether tension loss reduces playability or not. In fact, many "soft" strings like natural gut, Wilson NXT etc may play better at end life just before the strings break as long as the strings have not been in the racket for extended periods, which could be a few months or longer., Like opened tennis balls, even without play they go "dead" over time.Better to stick with rules of thumb if you have not broken the strings; restring beginning of each season if you play a couple times/wk. Restring each month during play season if you play more than twice/wk.Bottom line: put the $20 for this product towards your next restring!

The string tension tester is essential in keeping an eye on tennis string tension. I measure the tension immediately after stringing and then once a week or so. Once the tension drops more than 8 pounds (in my case from 56 down to 48), it is time to get a new string.Please keep in mind that "your mileage" will vary. I play with a stiff polyester string and even though the string bed still feels stiff, string tension could be significantly lower. The tension tester eliminates guesswork from the whole process.

Easy to use, Easy to carry and does the job to a good accuracy.