![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
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)