Today I went and bought 2 identical rackets that I'll be using for plastic shuttles, and I thought it was a good idea, since they were both brand new, to do a test and compare the quality/accuracy of a string job done by me and a string job done by a local (general) sports shop. Conditions: I tried to eliminate the most variables as possible, so this is what we have: Same racket (model) Same condition Same tension (22 x 24) Same string (both strings provided by myself) Same string color Same pattern* *I asked for 1 piece - 2 knots, however they started at T8 like in the manufacturer's stringing pattern and I started at T9 Variables: This is what can affect the result is some way Small variation in rackets of the same model (probably negligeable) Small variation in strings of the same model (probably negligeable) The extra/lack of string at the bottom Different stringing machines I tried to have both rackets strung at the same time, however they strung it a little before time, so there is probably a 30 mins -1 hour difference between when both rackets were taken off the machines. Assumptions: Their machine is supposed to be calibrated. Mine was calibrated. Stringing was done at around the same temperature Details to note: Their machine is a very good electronic machine (Babolat Star iirc) My machine is a decent/good electronic machine with WISE tension head, fixed clamps and 6 supports Tests: These are the tests I'd like to do with these rackets: Frequency/stringbed tension test Measured with ClearTune, hitting a small blunt object in the middle of the stringbed Playability test Will be tested on court next week Durability test Might not be tested fully as I might cut the strings before they break Test results: Frequency tests: 8 hours after stringing: Sports Shop racket: 906.1 Hz My racket: 1056.8 Hz Analysis:There is a ~15% difference between the frequency of both stringbeds. Using my frequency as a reference and using 22 lbs as a general tension (which sounds about right at 48 Hz/lbs), the stringbed produced by the sports shop would be at around 18.86 lbs. This is a huge difference considering that many of the variables were eliminated. While I can't expect the stringbeds to have the same frequency considering that there are variables that can affect it, I think it would be fair to expect a difference of less than 5% (more than 1 lbs in this case, which is big). Conclusion There are still other things to considerate and test, especially since the stringbeds didn't have time to settle yet. I will be doing more tests during the week and update my data/provide feedback. This is not 100% science and there might be things that I forgot to consider. I appreciate any feedback or recommendations that you may have, since I would like to create some kind of discussion around this. Questions are welcome too!