Product Spotlight of the Week: Beers ERT 300 Tennis Computer | The Tennis Depot Blog
ERT 300 TENNISCOMPUTER
Sports,Beers Technic Tennis Computer ERT 300 | PRO-STRING LONDON
ERT 300 Tennis Computer ERT-300
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