Dimensional Calibration Review the evidence needed to judge a height gauge across its working range, including the reference surface, selected test points, indication error, repeatability, uncertainty and certificate data. Contents Direct answer What the calibration evidence should establish Reference surface and setup controls Test points, direction and repeatability Indication error and correction Measurement uncertainty Certificate review Checking a NABL-accredited scope User review sequence Direct answer A height gauge calibration is useful when it shows how the instrument behaved at relevant positions across the working range under a defined setup. The result should identify the reference standards, test method, environmental conditions, indication errors, repeatability evidence, measurement uncertainty and any acceptance rule applied. Resolution is only the smallest displayed or graduated incr...