1. Use a highly sensitive location sensor and a red pilot light
2. LED lights instantly and it beeps when probe touches conductive work piece
3. There is a safety spring puller which puts the ball precisely back to the position when ball breaks away from ball seat ProductSiteLaunchDate : 2021-04-01T03:16:11.186Z ToleranceHeld : Precision UnitCount : 1 UnspscCode : 27112803