17-854-1 SPI Micrometer Set 0-150mm with CertSPI Standard Outside Mechanical Set Set includes 0 150mm Measuring Range 0. 01mm Graduations Accuracy 0 25mm model: + 0. 004mm 25 50 Model: + 0. 004mm 50 75 Model: + 0. 005mm 75 100 Model: + 0. 005mm 100 125 Model: + 0. 005mm 125 150 Model: + 0. 005mm Ratchet Stop Carbide Spindle Faces 0. 25" Spindle Diameter NIST Traceable Calibration Certificate Furnished in fitted case Micrometers included in set 0 25mm Outside Micrometer 25 50mm Outside Micrometer