• Master vernier caliper with inch/metric measuring range and 0.001"/0.02mm graduations for measuring the inside diameter (ID) and outside diameter (OD) of holes, grooves, and tube thicknesses
• Accurate, engraved, machine-divided graduations, and raised sliding surfaces to prevent wear of the graduations
• Hardened stainless steel construction provides durability and wear resistance
• Fine-adjust screw ensures accurate measurements and locking screw secures the measurement tightly in place for accurate reading
• Ground and lapped measuring faces provide wear resistance and long life