This Fowler micrometer, model 52-229-202, is designed for optimal quality, balance and accuracy. Fowler's precision micrometers offer advanced features and quality at a lower cost. This includes unique friction design for one-handed operation, insulated frame, .0001"/.01mm graduations and +/- .00016" accuracy. The friction/ratchet thimble assures consistent readings, and it has a satin chrome finished barrel, thimble and frame. A wrench is included for fast, easy adjustment.