Registered laboratories of the United Kingdom Accreditation Service (UKAS) carry out measurements and calibrations that are traceable to national measurement standards held in the UK's National Metrology Institute (NMI), the National Physical Laboratory (NPL). Each UKAS-certified micrometer is permanently marked with an individual reference number, and is supplied in a baize-lined wooden box.
Stage micrometers for use with transmitted light are available with different line lengths and sub-divisions as detailed below:
AGL4201 Stage micrometer, 10mm scale, 0.1mm sub-divisions, line width 5µm, accuracy <2µm overall
AGL4078 Stage micrometer, 1mm scale, 0.01mm sub-divisions, line width 2µm, accuracy <1µm overall
AGL4202 Stage micrometer, 0.1mm scale, 0.002mm sub-divisions, line width 1µm, accuracy <1µm overall
AGL4203 Stage micrometer, 0.1″ scale, 0.001″sub-divisions, line width 2µm, accuracy <0.0001″ overall