American FarmWorks HTTS Zareba Large Fence Tension Spring for Electric Fence

Features: 

• Tension spring accurately measures fence wire tension
• One inch of spring compression equals 150 lb. of tension
• Reacts to the expansion and contraction on the fence wire
• Conductive metal spring maintains fence power
• Use one large fencing spring with every in-line strainer you install
• Absorb pressure on your fence and maintain fence power while installed
• Reacts to the expansion and contraction caused by changing temperatures
• Provides visual feedback of the tension on the wires