The Standard Gage 00224002 Value Vernier Depth Gauge has a measurement range of 0 to 6" and is accurate to + or - 0.00020". Gradient spacing is 0.001" and the base is 2.5". Six high accuracy interchangeable depth rods are adjusted in increments of 1". The ratchet friction thimble and locking nut provide accurate measurement readings and adjustments. The base surface is hardened and ground for accurate readings. There is no need for resetting when changing rods. The gauge is made of steel for durability. Designed for measuring the depth of holes, slots, and recesses, and for inspecting jib, fixtures, and die work, these depth gauges are also convenient for measuring coordinate distances from a work surface to toolmakers' buttons.

Bore gauges measure holes, or bores, in a workpiece. They can measure the interior diameter of a hole at any depth, while internal micrometers can only measure to the depth of their teeth. Bore gauges are typically calibrated with a setting ring and come in two types: simple and direct-measuring. Simple bore gauges are used with a caliper to transfer the hole measurement, while the more complex gauges take the measurement directly, and display it through a vernier, dial, or digital display. Bore gauges have a two- or three-point contact, indicating how many points on the gauge head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point contacts are used to measure lobing or triangular form error. Pistol-grip bore gauges are used for fast, single-handed operation with repeatable results from one operator to another. Bore gauges can also be used in special applications, such as measuring threads, spline pitch diameters, and deep bores.

Standard Gage manufactures precision measuring equipment and metrology hand tools. The company is headquartered in North Kingstown, RI.