The Mitutoyo 129-127 depth micrometer has a measurement range of 0 to 4" and a resolution (or smallest graduation interval) of 0.001". The vernier scale provides precise measurements, and it includes four interchangeable 0.157"diameter measuring rods for flexibility in measuring range. The gauge has a ratchet stop for uniform pressure and a measuring rod clamp for stability. It has a satin chrome finish on the body for readability and the base is made of hardened steel for durability and accuracy. It comes in a fitted plastic case. This depth micrometer is suitable for precise measurement in a variety of manufacturing, machining, and mechanical engineering applications.

Depth gauges are precision measuring instruments used to determine the depth of any shape that has a step, groove, or slot. These gauges often take the form of sliders that travel on a measuring beam or rods, are moved to position by hand, and then adjusted with a calibrated screw. The base of the gauge rests at the top of the shape whose recession is to be measured, while the beam or rods extend to the bottom of the recession to determine the measurement. Gauge position is read from a graduated scale, dial, counters, or an electronic display.

Mitutoyo manufactures precision measuring tools, metrology equipment, and related systems. The company, founded in Tokyo in 1934, formed Mitutoyo America Corporation in 1963 with headquarters in Aurora, IL.