... CAT6,CAT7 2,Motorized take-up with constant tension 3,Accurrate twist distance 1,Application:Applicable ... range100g-1000g,stable and adjustableBack-twist tension standVertical double head,tension wheel 120mm,3+3 ditch,pecision potentionmeterPay- ... off deviceAccumulative type tension sensor stand,inked with pay-off motor,ensure constant tension ...