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
Messeflyer 2 - ERT 300
Top Serve Tennis
BEERS ERT 300 Tennis Computer- A Must Have for any Racquet Stringer & Tennis Enthusiast | The Tennis Depot Blog