Feature: 1. Measurement can be taken closer to the bottom of the blind bore, and can be
taken into a deep hole with an extension rod. 2. Highly durable because of carbide-tipped contact points. 3. Ratchet stop. 4. Within 100mm/4'':supplied with setting rings. Over 12mm/0.5'': Titanium-plated anvils optional. 5. Resolution: within 12mm/0.5'':0.001mm(Metric);0.0001''(Inch). Over 12mm/0.5'':0.005mm(Metric);0.0002''(Inch). 6. Supplied in the storage case.