Maximum Measurement

Inside Micrometer and Bore Gauge Maximum Measurement

The maximum measurement specifies the smallest (minimum) and largest (maximum) dimension or hole diameter that the instrument can measure. For example, an inside micrometer with a maximum measurement of 2 to 3mm has a length of 2mm when fully collapsed, and can be extended to measure a span up to 3mm. A bore gauge with a maximum measurement of 2 to 3mm can fit in a hole that is 2mm in diameter or larger, and can be expanded to measure a hole diameter no larger than 3mm.