Measuring Micrometer Outside Micrometer: Strain ? Chrome Finished Frame, Carbine tipped measuring faces. Flatness of 0.6 mm parallelism of 2mm for models up to 75mm, 3mm for 100mm models. Inside Micrometer: Wide range of ID measurements with Interchangeable rods. Each rod is marked with its measuring range. Both micrometer head and furnished rods are strain ? chrome finished throughout. Ranges of 25-32mm, 25-50mm, 50-63mm, 50-200mm, 50-300mm, 200-225mm, 200-1000mm. Qty :