Feature:
* Patent structure for large measuring range.
* Self-centering 3-point for accurate measurement of internal diameters.
* Highly durable with carbide-tipped contact points.
* Easy access to deep holes with extensions.
* Ratchet stop for exact repetitive readings.
* Supplied with setting rings for zero adjust.
* Resolution: 0.001mm(Metric); 0.0001¡±(Inch).