Product Spotlight of the Week: Beers ERT 300 Tennis Computer | The Tennis Depot Blog
How To Accurately Measure Tension Loss | Inspired Tennis
ERT300 Tennis String Tester - ERT Technic AG
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