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Micro-Metrics’ OG212 Tooke Paint Inspection Gauge is used to examine a cross-section of cured coatings to measure thickness or analyze coating problems. Using a special cutting tool integral to the gauge, a small, precision V-groove is made through the paint film and into the substrate. This groove is observed with an illuminated, 50-power microscope bearing a measuring scale, making possible the direct measurement of coating thickness. The Tooke Gauge has been used to assess sandblast, measure plating and paint thickness on ceramics, metal, wood, concrete and plastics, as well as the protective backing on mirrors.
The OG212 is fitted with an universal microscope with a measuring reticule permitting measurements in mils, microns, and millimeters. Enhanced dual-measure scope features a reticle marked in mills and microns. Three precision Tungsten-carbide cuttings tips are mounted in the side of the anodized-aluminum gauge body.
The Tooke Paint Inspection Gauge is used for coatings evaluation in accordance with ASTM D4138 – 07a: Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
Reticle Specifications:
| Cutting Tip | Maximum Coating Thickness | Precision of Thickness Determinations | One Division on the reticle scale represents: |
| 1x | 100 mils 2500 µm | ± 0.25 mils + 5 µm | 1.0 mil 20 µm |
| 2x | 20 mils 500 µm | 0.13 mils + 2.5 µm | 0.5 mil 10 µm |
| 10x | 3 mils 75 µm | 0.025 mils + 0.5 µm | 0.1 mil 2 µm |
