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
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
![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)