Starrett 762MEFL-25 Digital Micrometer Head, Non-Rotating Spindle, 0-25mm Range, 0.001mm Graduation, +/-0.003mm Accuracy, Friction Thimble, Lock Nut, Carbide FaceLarge digital readout is easy to read, reducing errors Attractive black wrinkle finish on frame Starrett no glare satin chrome finish on thimble and sleeve Ring type knurled lock nut Extremely hard and stable one piece spindle (the heart of our accuracy) Auto OFF after 30 minutes of nonuse Inch millimeter conversion Measurement HOLD button Ability to zero tool at any position Ability to retain and return to the true zero reading of the micrometer