div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: €¦ · RACKET TWISTING STRENGTH TESTER QBT 2770 This machine is designed to determine the twisting strength of badminton and tennis rackets Two supports of the machine are used src=https:reader037fdocumentsinreader037viewer2022090608605ea0ae2d2405109e48ec58html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv