The Mitutoyo 104-142A Outside Micrometer with Interchangeable Anvils has the following specifications: ● Range: 300-400mm● Resolution: 0.01mm● Mass(kg): 3.31● Remarks: with 4 anvils & 4 standardsFeatures:● Wide measuring range with interchangeable anvils.● With a Ratchet Stop for constant force.● Supplied with zero-setting standards bar for each range.● Supplied in fitted wooden case. The Mitutoyo outside micrometer with interchangeable anvils features a ratchet stop function and interchangeable anvils for measuring a wide range of workpiece sizes and material types with precision. This series of micrometers with interchangeable anvils are available in inch and metric measurements. The Mitutoyo 104-142A outside micrometer is ideal for measuring metal and non-metal workpieces by controlling the amount of force applied by the spindle. A ratchet-stop mechanism provides uniform pressure on a workpiece for precise, repeatable measurements. Interchangeable anvils allow for measuring a wide range of workpiece sizes.