For a long time the raquettune app for me has been very decent for me, but the past few weeks every re-string I have done has been WAY off. Raquettune has been reading WAY over. I calibrated my Wise 2086 with a Wise 2090 calibrator which was BANG on correct. I have just strung a Pure Drive with 1.25 Poly @ 55lbs. I did a tension reading immediately after completing the restring and it read 64lbs on raquettune. I did the test 5 times, same results. I decided to delete the app and re-install it straight away (this took all of appx 45 seconds). I then did another tension reading , and now it shows just under 58lbs!!! What the hell is going on with this app? 6lbs tension loss is just under a minute? I don't think so! Also the string bed doesn't feel as tight as what 64lbs would be.