String MD - I use an ERT 300 tennis computer to measure the dynamic tension on every string job. The ERT 300 measures the DYNAMIC TENSION DT (string bed stiffness) by electronic
![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)
BEERS Technic | ERT 300 Tenniscomputer: to measure the dynamic tension, power and control of your racket
![ERT 300 TENNIS COMPUTER - pomiar stanu naciągu - Szkoła Narciarska SUPERNARTY.pl - Jelenia Góra, Karpacz ERT 300 TENNIS COMPUTER - pomiar stanu naciągu - Szkoła Narciarska SUPERNARTY.pl - Jelenia Góra, Karpacz](http://old.supernarty.pl/img/zdjecia/tenis_ert300-dysk_600px.jpg)
ERT 300 TENNIS COMPUTER - pomiar stanu naciągu - Szkoła Narciarska SUPERNARTY.pl - Jelenia Góra, Karpacz
![Santa Barbara School of Tennis - Hilton Santa Barbara Beachfront Resort - Learn how to compete, win, and enjoy the game of tennis! - Pro Shop and Services Santa Barbara School of Tennis - Hilton Santa Barbara Beachfront Resort - Learn how to compete, win, and enjoy the game of tennis! - Pro Shop and Services](http://sbschooloftennis.com/images/Gamma-ATS-ERT-300-Tenniscomputer.gif)