Dasqua 2-3" inside micrometer is ideal for measuring various inside dimensions. graduation is 0.001". Caliper type jaws designed for measuring intricate internal dimensions. The accurately ground measuring faces are carbide tipped ensuring reliable measurements. Exceptionally clear graduations and markings for easy reading. Spindle is precision ground to assure exceptionally accurate measuring. Super smooth ratchet with innovative low force. Force measurement range is SN to 7N with the error range in 2N. Locking clamp to hold spindle and measurement in place. Threaded parts are chrome plated. Ratchet thimble maintains uniform measuring pressure. Improved satin chrome finish on barrel and thimble. Fitted case included.