Dial Indicators, Micrometers, Calipers manufacturer / supplier in China, offering IP54 Protection Degree 50-63mm/2-2.5" Blind Hole Deep Hole Bore Diameter Measuring Tool Digital Three Point Internal Micrometer for Machinery Workshop, High Precision 25-30mm/1-1.2" Electronic 3 Jaw Inner Micrometer with Extension Rod & Setting Ring for Machinery Workshop, IP54 Double Display Digital Outside Micrometer Set with 0-30/20-50/45-75/70-100mm for Workshop Machining and so on.