The yo-yo ball rope extension test instrument makes the length measuring system (to calculate the elongation length) and the yo-yo ball installed in the same spindle for rotating. When the yo-yo ball rotates at the speed 80r/min, the line of the ball will stretch along the centrifugal direction, and the test line(one end fixed in the ball, the other end fixed on the trolling reel) is connected with the encoder, the trolling reel and the spindle of the encoder are free state, and the bearing friction can be ignored.

Specification:
Test speed: 80R/min
Scale: 2 group
Dimension (WxDxH): 1100x350x1300mm
Rotating speed: 1-150(adjustable) 
Stroke: 0-1000MM (adjustable) 
weight (Kg): 55Kg
power: 1∮ AC  220V
Standard: ASTM F963 8.23