![How the ERT 300 Tennis Computer will make you that $$$ by closing the sale! Tennis Stringing Tips! - YouTube How the ERT 300 Tennis Computer will make you that $$$ by closing the sale! Tennis Stringing Tips! - YouTube](https://i.ytimg.com/vi/DGFXCDx4D4w/hqdefault.jpg)
How the ERT 300 Tennis Computer will make you that $$$ by closing the sale! Tennis Stringing Tips! - YouTube
String MD - With the ERT 300 Tenniscomputer, you'll know when it's time to restring your racquet. The display shows current stringbed stiffness (dynamic tension), indicating the power and aggressiveness of play
![BEERS Technic | ERT 300 Tenniscomputer: to measure the dynamic tension, power and control of your racket BEERS Technic | ERT 300 Tenniscomputer: to measure the dynamic tension, power and control of your racket](https://www.beers-technic.ch/img/intro/ert_racket.jpg)