Technical Data:
Tubular inside micrometer
Range: 50-850mm
Micrometer head: 50-75mm
Travel of micrometer head: 25mm
Graduation: 0.01mm
Accuracy: 15um
Carbide measuring faces
Extension rods: 25mm, 50mm, 100mm, 200mm, 400mm

Dimensions:
Extension rod/body diameter=dia.17mm
Measuring end/reference diameter=dia.12mm
Drawing reference length=47mm
Spherical radius=SR20