Inside Micrometer Internal Diameter Metric Screw Carbide Gauge Precision Measuring Instrument Internal Diameter Gage Gauge Tools Product Parameters: Product Name: Inside Micrometer specification:5-30/25-50/50-75/75-100mm Calibration Process: Laser Calibration Force Measuring Type: Inner Diameter Measurement Product Specifications: Various Specifications Measurement Type: Internal Dimension Measurement Resolution: 0 Accuracy: ± zero / ± 0 Packing Method: Plastic Box Packing Our Product Advantages: 1 Four Times Laser Marking, Clear And Intuitive Reading 2 High-quality Steel Alloy Measuring Surface Measuring Precision Aperture three The Shell Is Chrome-plated, Beautiful And Wear-resistant four Ratchet Lock Knob To Maintain Constant Measuring Force 5 Spiral Anti-skid Treatment, Stable And Error-free