Microscope : A standard Microscope unit having 30x magnification is provided with a rota table cross line, and the eye piece can be focussed as per individual's requirement. Working : The whole microscope tube unit can be raised or lowered can clamped at any desired position. The focussing of the Microscope unit is done by rack and pinion arrangement. Longitudinal Movement : The longitudinal movement of the Microscope saddle for the purpose of the Rings is done by rotating the drum provided. The 26 mm movement can be read by scale and on the divided drum to 0.001 cm