The Moore & Wright 900 Series Internal Micrometers comprise of a measuring head, a set of extension rods and a spacing collar to facilitate alternative measuring ranges. The smaller models (901, 902 & 903) have detachable extension handles.

All models supplied in a fitted case.

These 900 Series Internal Micrometers conform to BS959 Standards.

The Moore & Wright Internal Micrometer 901M Internal Micrometer has the following specification:

Range: 25-55mm.
Head Range: 5mm.