For measurement of small outside diameter, thickness etc. Ideal for engineering and technical schools to teach the working of this instrument. Consists of a frame of solid brass body with a chrome satin ï¬nish and a hardened steel screw. Provided with a ratchet and a lock nut for accurate readings. Zero adjustment is possible. Pitch of the screw is 0.5mm and the least count is 0.01mm. Micrometers with English scale has pitch of 0.05in and the least count of 0.001in. Packed in a plastic case.