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The Starrett 644 Series Dial Depth Gauges, Indicator Type, Inch, have a measurement range of 0 to 3", a resolution (or smallest graduation interval) of 0.001", with + or - 1 graduation (0.001") for the first 2.5 revolutions of accuracy. The dial face has distinct, easy to read figures. The gauges in this series are intended for longer distances and include three round-end contact points to cover the range. The base of these gauges is 2.5" long, and is hardened and ground for durability and accuracy. Model 644JZ includes a fitted case; model 644J is not sold with a case. Electronic indicators and flat-end contact points are sold separately. Depth gauges are typically used in manufacturing, machining, and mechanical engineering.
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.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.
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