Mechanical 3-Point Inside Micrometer Range 0.35 in to 0.425 in Resolution 0.0001 in Inside Micrometer Type 3-Point Inside Micrometer Number of Micrometers 1 Operation Type Mechanical Thimble Type Ratchet Contact Point Material Steel Included Certification Inspection Certificate Includes 0.35 in Dia Setting Ring 4 in Extension Rod Lock Nut Type Ratchet Stop Maximum Measurement - Inch 0.425 in Minimum Measurement - Inch 0.35 in Rod Lengths Included 4 in Accuracy +/-0.00016 in