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 ERT 300 Tennis Computer- A Must Have for any Racquet Stringer & Tennis Enthusiast | The Tennis Depot Blog BEERS ERT 300 Tennis Computer- A Must Have for any Racquet Stringer & Tennis Enthusiast | The Tennis Depot Blog](https://thetennisdepot.files.wordpress.com/2014/03/kgrhqzhge2fw7bksybn5c0dfbr0_12.jpg)
BEERS ERT 300 Tennis Computer- A Must Have for any Racquet Stringer & Tennis Enthusiast | The Tennis Depot Blog
![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)