The anvil and the spindle have a blade for measuring the groove diameter of shafts, keyways, and other hard-to-reach areas
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The Mitutoyo 122-101-10?Blade Micrometer has the following specifications:
nRange: 0-25mm
nAccuracy: +/- 0.003mm
nResolution: 0.01mm
nRemarks: Type A
n(3+R/100) microns for models over 75mm
nParallelism: 0.00012-inch for models up to 3-inch
nR=maximum range (mm) 0.00016-inch for 4-inch models
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