The Fowler 52-225-224-1 Premium Depth Micrometer has a measuring range of 0-6" and ±0.0003" accuracy. This depth micrometer is suitable for precise measurements in various 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 gages often take the form of sliders that travel on a measuring beam or rods, are moved to the position by hand, and then adjusted with a calibrated screw. Fowler, an American company, manufactures premium inspection and measurement instruments like electronic indicators, calipers, bore gages, and micrometers. The company, founded in 1946, is headquartered in Canton, MA.