Zareba Large Fence Tension Spring

The Zareba Large Tension Spring measures wire tension on the fence line. One inch of compression equals 150 lbs. of tension. This spring helps absorb expansion and contraction of the fence wire. Use one with every in-line strainer. Specifications: ?Çó Measures wire tension on the fence line ?Çó One inch of compression equals 150 lbs. of tension ?Çó Helps absorb expansion and contraction of the fence wire ?Çó Use one with every in-line strainer