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The Starrett 449 Vernier Depth Gauges, Micrometer Type, Inch, depending on the model, have a measurement range of 0 to 3" or 0 to 6", a resolution (or smallest graduation interval) of 0.001", with + or – 0.0001" of accuracy. The vernier scale enables precise measurements in fine units. The gauges in this series have non-rotating blades, or flattened probes, that are 1/64" wide by 1/8" long, and can be used to measure narrow recessions without the blade slipping off of a surface. These units include measuring rods to cover the intended range. They come with a ratchet and speeder to enable the users to apply uniform pressure and make quick adjustments for precise measurements. Depending on the model, the bases are either 2.5" or 4" long and all measuring surfaces of these units are hardened, ground, and lapped for durability and data accuracy. These units include a protective case. 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.
From the Manufacturer
The purpose of these tools is to measure the depth of holes, slots, shoulders, and projections quickly and easily.
Amber Lee
Reviewed in the United States on January 20, 2018
I never got a 0" pin and it's a 0"-3" depth mic, so it's mostly useless without it.
John P.
Reviewed in the United States on June 14, 2015
Excellent tool. I have used it quite a bit. It's far far better than using the depth measurement device on my calipers. I wish I had bought one earlier!
1201MAX
Reviewed in the United States on January 4, 2012
Starrette tools are quality and function that blows away the competition. Starrette backs there tools. This tool performs flawlessly daily.
T. Prince
Reviewed in the United States on August 11, 2007
I purchased this for gunsmithing applications. The non-rotating blade is perfect for measuring barrel shoulder depth from the breech face. The blade can be rotated by hand for the proper position and by "non rotating" that means the blade does not turn as the mic is measuring; the blade will not torque "off" the shoulder.
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