SPI Quick-Action Electronic Micrometer It fully opens and closes in less than 1 second! Features Include... 0-1" / 25mm Measuring Range 0.00005" / 0.001mm Resolution + 0.00016" / .00004mm Accuracy Lever Activated Carbide Faced, non-rotating Spindle IP65 Rated Protection Spindle Diameter: 0.255" / 6.5mm Automatic Shut Off Ball Attachment Included Includes Case 10-800-1 Flyer