Surface-Finish Scales with Certificate of Calibration
This scale comes with a calibration certificate traceable to NIST that states it has passed a test for accuracy. Compare your surface finish to one of the swatches on the scale. The finishes are expressed in microinches (µ").
| No. of Swatches | Scale | For Surface Type | Surface Finish Range, microinch | Lg. | Wd. | Material | Each | |
| 22 | Ra | Ground, Lapped, Milled, Profiled, Turned | 2-500 | 2" | 5 3/8" | Nickel Alloy | 0000000 | 0000000 |