The SquareMaster can measure with an accuracy of ± 0.000050 of an inch (50 millionths) over any 12” or 18″ of specified range. No hand gage even comes close. The SquareMaster can be used for virtually any measurement of straightness, squareness or parallelism on interior or exterior surfaces. Its precision direct dial readout substitutes reliable and repeatable results for the subjective calculations you probably now make.
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