The German QNix Nix Fe/Nfe2mm Thickness Gauge probe is a magnetic induction and eddy current dual-purpose coating Thickness Gauge, with a thickness measurement range of 0~2000 microns, and the Fe/Nfe2mm Thickness Gauge probe is a supporting probe of QNix7500 anti-corrosion layer Thickness Gauge, with a measurement accuracy of 0-50μm: ≤±1μm, 50-1000μm: ≤±1.5%, 1000-2000μm: ≤±2%.

| Model | Fe-2000 | Fe-5000 | Nfe-2000 | Nfe-5000 | Fe/Nfe-2000 | Fe/Nfe-5000 |
| matrix | iron | iron | Non-iron | Non-iron | Iron/non-ferrous | Iron/non-ferrous |
| Probe form | One/Split | One/Split | One/Split | One/Split | One/Split | One/Split |
| Measuring range | 0~2000μm | 0~5000μm | 0~2000μm | 0~5000μm | 0~2000μm | 0~5000μm |
| Measurement accuracy | 0~1999μm:±(1μm+2%) | 0~1999μm:±(1μm+2%); 2000~5000μm:±3.5% | 0~1999μm:±(1μm+2%) | 0~1999μm:±(1μm+2%); 2000~5000μm:±3.5% | 0~1999μm:±(1μm+2%) | 0~1999μm:±(1μm+2%); 2000~5000μm:±3.5% |
| Minimum measuring surface | Fe:φ25mm;NFe:φ25mm | |||||
| Minimum radius of curvature | Convex φ5mm, concave φ25mm | |||||
| Minimum substrate thickness | Fe:200μm;NFe:50μm | |||||