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The Testex Linearizing Spring Micrometer Dial Gauge Inch Units is to be used with a Testex replica Press-O-Film Tape to measure the surface roughness of blast cleaned surfaces. The replica is quantified using a spring loaded micrometer to determine the maximum peak-to-valley depth. Kit Contents: Testex Linearizing Spring Micrometer Dial Gauge, plastic burnishing tool, instructions and carrying case. Kit Contents: Testex Linearizing Spring Micrometer Dial Gauge, plastic burnishing tool, instructions and carrying case. CERTIFICATE OF CALIBRATION NOT INCLUDED