... Steel/Die Steel/etc.Other Special Materials: Lucite / Nylon / Bakelite / Plastic/etc.Various kinds of materials can be chosen, we can ... (machine),digimatic micrometer, internal micrometer, mechanical caliper , vernier caliper ,caliper(digital),caliper(machine),caliper(dial),diameter scale, depth micrometer, digital caliper, altitude gauge, electric balance), 2D measurement ...