Designed for robustness, the PosiTest uses a permanent rare-earth magnet and calibrated spring system to determine coating thickness without electronics. Its simple operation, audible indicator, and conforming to ASTM/ISO standards make it useful for inspectors, coating applicators, and maintenance engineers in challenging environments.
DeFelsko PosiTest (Magnetic / mechanical coating thickness gauge)
The PosiTest gauge provides fast, non-destructive measurement of paint, plating, and coatings on steel substrates via magnetic pull-off. Its design includes a durable carbide probe, positive reading indicator, and “V” grooves for cylinders. No batteries are required, making it reliable for field operations under harsh conditions.
Features
Overview
| Specification | Value / Description |
|---|---|
| Measurement principle | Magnetic pull-off (mechanical, spring + magnet) |
| Substrate type | Steel (ferrous) using non-magnetic coatings |
| Models / scales available | GM (0–8 mils), G (0–200 µm), FM (0–80 mils), F (0–2000 µm) |
| Tolerance / accuracy | GM: ±0.04 mils up to 0.8 mil; ±5% over 0.8 mil FM: ±0.2 mils up to 4 mil; ±5% over 4 mil G: ±1 µm up to 20 µm; ±5% over 20 µm F: ±5 µm up to 100 µm; ±5% over 100 µm |
| Housing / material | Rugged mechanical housing, resistant to shock, water, acids, solvents |
| Calibration / certificate | Supplied with Long-Form Certificate of Calibration traceable to PTB (or national lab) |
| Operating temperature (surface) | Gauge measures on surfaces from –50 °C to 100 °C (when gauge itself is within –10 °C to 60 °C) |
| Immersion / water resistance | Can be immersed (fresh/salt water); recommended rinse after saltwater usage |
| Size / dimensions | 108 × 43 × 20 mm (4.25″ × 1.7″ × 0.8″) |
| Weight (without batteries) | 54 g (1.9 oz) |
| Standards / compliance | Conforms to ASTM D7091 / B499, ISO 2808, etc. |
