Specification:
Shank Diameter: approx. 20mm
Length: approx. 160mm
Ball Diameter: approx. 10mm
Battery: 2 x 1.5V(not include)
Accuracy: 0.005MM

Feature:
Use a highly sensitive location sensor and a red pilot light.
Quickly locate work edges, save time when finding positions on milling machines, jig borers etc etc.
Probe hardened and precision ground.
Not necessary to rotate while measuring.
LED lights instantly and it beeps when probe touches conductive work piece.
There is a safety spring puller which puts the ball precisely back to the position when ball breaks away from ball seat.
High strength and hardness.
Durable in use.