It is made of all metal. Perusing are taken scale andvernier. The vernier is mounted on a slide which isadjustable to peruse upto 0.1 mm. For coarseadjustment a screw Is given at the back of theslide and the line movement goes around 20 mm. In onetraverse by a screw handle gave at the highest point of theoutfit. Extents (a) 7.5 cm (b) 15 cm (c) 30 cm.

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