Digital 3-Point Bore Micrometers

Description Self-Centering 3-Point Bore Micrometers for accurate Measurement of Internal Diameters. Each 3-Point Bore Micrometer comes in its own fitted hard case complete with setting ring and depth extension. Ring gage certificate to NIST available upon request. Features Self-aligning and self-centering Carbide tipped measuring contact points suitable for blind bore measurements Ratchet stop provides uniform measuring Setting ring accuracy ±.000020" Resolution: .00005"/0.0001mm (inch/metric conversion) Thimble Graduation: 0.0001" Easy to read electronic digital display with the following measurement functions:                 - Absolute and incremental measurement                  - Tolerance settings                  - Preset (+ and -)                  - Hold Key                  - SPC data output capability (RS232C) Each 3-Point Bore Micrometer comes in its own fitted hard case complete with setting ring and depth extension. Ring gage certificate to NIST available upon request. Dimensions  Model No. Measuring Range Accuracy Extension Rod Length Setting Ring Dia. 20850 .275 - .350"/6-8mm .00016 4" .35" 20851 .350-.425"/8-10mm .00016 4" .35" 20852 .425-.500"/10-12mm .00016 4" .5" 20853 .500-.650"/12-16mm .00016 6" .5" 20854 .650-.800/16-20mm .00016 6" .65" 20855 .800-1.000"/20-25mm .00016 6" 1.0" 20856 1.000-1.200"/25-30mm .00016 6" 1.0" 20857 1.200-1.600"/30-40mm .00016 6" 1.6" 20858 1.600-2.000"/40-50mm .0002 6" 1.6"