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#.

This worked great, it was very accurate and easy to use.I purchased a different brand of tension tester prior to buying this one and it was way off. I highly recommend this tension tester.

It does do its job. Perhaps gauge numbers not exactly precise.

TL;DR: Handy concept for checking string tension, but in my experience the readings are inconsistent enough that I only trust it for very rough comparisons, not precise numbers. I bought this Gamma string tension tester hoping to track how my tennis string tension changes over time and to compare racquets more objectively. The device is simple to use. You place it on a main string, squeeze until the reference marks line up, then read the approximate tension on the dial. It is small, light, and easy to keep in a bag. In practice, though, I have found the results difficult to interpret with much confidence. The reading can vary several pounds depending on exactly where on the string bed you place it, how carefully you align it, and even how firmly you squeeze. The situation is further complicated by differences in string material, gauge, string pattern, head size, and how recently the racquet was strung. Two racquets that I know were strung at the same reference tension with the same machine do not necessarily give comparable numbers with this tool. This is only an opinion, not objective truth, but it has been a consistent pattern for me. Where it has some value is as a very general indicator. If a racquet has clearly lost a lot of tension, the readings will usually trend lower than when it was freshly strung, and you can sometimes use that as a reminder that it is time for a restring. I would not use it to verify a stringer’s accuracy or to fine tune tension choices within a narrow range. Overall, I see this more as a rough reference gadget than a precise measuring instrument. If you understand its limitations, it may be modestly helpful, but I would be cautious about relying on the numbers too literally. Thank you for reading my review here, I try to be helpful. Notify/write to me here on Amazon if you have any additional questions for me

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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!

Surprised with how accurate this little tool is. Tested a freshly strung racquet as well as two racquets strung a month or so ago but only used once or twice. Tension reading within one pound or right on. Very happy so far...

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#.

Very Good too have one ! As it test your string tension when needed.

The device works as expected. The measurement uses Strength Tension Index (STI). This is different from LBs, if you want to know the current tension, there is a formula you can use. To calculate the tension in LBs you need to know the racket min and max racket tension. With those numbers you then can use the following formula. Tension (lbs) = Minimum Tension (lbs) + [(Maximum Tension (lbs) - Minimum Tension (lbs)) x (STI ÷ 100)] For example I got fresh strings today, the STI is a little before 38, to calculate the tension, I checked online my racket has a min 48lbs max 57lbs tension. With all that we plug it into the formula Tension (lbs) = 48 + [(57 - 48) x (38 ÷ 100)] = 48 + [9 x 0.38] = 48 + 3.42 = 51.42 lbs

Ottimo strumento, facile da usare e preciso, ovviamente misura in Pounds.

Funktioniert gut und einfach.

J ai testé sur les quatres raquettes de mon fils sorties de chez le cordeur et cela donne une bonne estimation de la tension. Ce n'est pas aussi précis qu'une montre suisse, mais à 500 grammes près . Très bon outils pour savoir si vous devez faire recoder vos raquettes.