NM01PosiTestFM
Choose Quantity
DeFelsko PosiTest FM Magnetic Pull-Off Coating Thickness Gage
SKU: PosiTestFM
A rugged, battery-free magnetic pull-off gage ("banana gauge") for non-destructive measurement of paint, enamel, plastic, galvanizing, metalizing and plating on steel, with a 0 to 80 mil scale.
| 0–80mils range | ±0.2mils up to 4 mils | 0Batteries needed | 2 yearsWarranty |
The DeFelsko PosiTest FM is a magnetic pull-off thickness gage for the non-destructive measurement of non-magnetic coatings on steel, including paint, enamel, plastic, galvanizing, metalizing and plating. Its FM scale reads from 0 to 80 mils, ideal for hot-dip galvanizing, hard chrome metalizing, paint, enamel and plastic coatings.
It works on a permanent rare-earth cobalt magnet with no batteries or electronics, so it won't drift or lose calibration, even after years on the shelf. A wear-resistant carbide probe, an extra rugged housing and a Long-Form Certificate of Calibration make it a dependable everyday tool, conforming to ASTM D7091/B499, ISO 2808 and other standards.
See It in Action
Key Features
 | Wide 0 to 80 mil scaleThe FM scale covers thick protective coatings such as hot-dip galvanizing, hard chrome metalizing, paint, enamel and plastic on steel. Accuracy is ±0.2 mils up to 4 mils and ±5% of the reading above 4 mils. |
Measures parts of almost any shapeThe fully supported design positions positively with no pivoting during measurement, and the gage can also be used with only the front probe area touching the surface. V-grooves in the probe housing and base center it on cylindrical parts, and because it's precisely balanced and independent of gravity, it works in any position. |  |
 | Carbide probe and permanent magnetA highly wear-resistant carbide probe gives the longest life and continued accuracy. The rare-earth permanent magnet prevents any drift over time, so the PosiTest stays calibrated with no batteries to replace. |
Built for the Field
Clear, positive readings
Visual and audible indicators confirm when a reading is established. The large dial holds the reading after the gage is lifted from the part, for better accuracy and ease of use than pencil-style gages.
One-finger operation with GO/NO-GO
Probe contact and dial rotation are done with one finger, and the GO/NO-GO button can be preset for rapid pass/fail checks.
Extra rugged, even underwater
The housing isn't affected by mechanical shock, water, acid or solvents. Corrosion-resistant brass construction allows use immersed in fresh or saltwater; just rinse with fresh water after saltwater use.
Hot surfaces and hazardous areas
With the gage kept within its own operating range, it can measure surfaces from -50°C to 100°C (-58°F to 212°F). Its fully mechanical design has no electronics, so it doesn't need intrinsic safety certification for hazardous environments.
Certified accuracy
Every gage ships with a Long-Form Certificate of Calibration traceable to NIST or PTB, documenting actual readings from DeFelsko's lab. Matching calibration standards and procedures are available, and the center of the dial cover removes for easy calibration adjustment.
Specifications
| General | |
| Manufacturer | DeFelsko |
|---|---|
| Model | PosiTest FM |
| SKU | PosiTestFM |
| Instrument type | Magnetic pull-off (mechanical) coating thickness gage |
| Warranty | 2 years |
| Shipping dimensions (estimated) | 203 × 152 × 102 mm (8.0 × 6.0 × 4.0 in) |
| Shipping weight (estimated) | 0.45 kg (1.0 lb) |
| Measurement | |
| Principle | Magnetic pull-off, permanent rare-earth cobalt magnet |
| Substrate | Steel (ferrous metals) |
| Coatings | Non-magnetic: paint, enamel, plastic, galvanizing, metalizing, plating |
| Scale | FM: 0 to 80 mils |
| Tolerance | ±0.2 mils up to 4 mils; ±5% of reading over 4 mils |
| Probe | Highly wear-resistant carbide |
| Indicators | Visual and audible; reading held after removal; preset GO/NO-GO button |
| Physical & Environment | |
| Power | None; no batteries or electronics |
| Construction | Extra rugged, corrosion-resistant brass; resists shock, water, acid and solvents |
| Operating temperature | Gage and surface at same temperature: -10°C to 60°C (14°F to 140°F) |
| Surface temperature | -50°C to 100°C (-58°F to 212°F), with gage at normal room temperature |
| Underwater use | Yes, fresh or saltwater |
| Standards & Calibration | |
| Conforms to | ASTM D7091/B499, ISO 2808 and others |
| Certificate | Long-Form Certificate of Calibration traceable to NIST or PTB, included |
What's in the Box
- DeFelsko PosiTest FM coating thickness gage
- Wrist strap
- High-quality leather case with belt loops
- Instructions
- Long-Form Certificate of Calibration
Standard DeFelsko package. Contents can vary by package, so contact us to confirm what ships with your order.
Complete your coating inspection kit
Add DeFelsko coating thickness standards to verify accuracy. For coatings on aluminum and other non-ferrous metals, see the PosiTest DFT Combo or PosiTector 6000 N. For small, hot or hard-to-reach surfaces, consider the PosiPen.
Applications
The PosiTest FM measures non-magnetic coatings on steel in the shop, the field and wet or hazardous environments.
| ✓ Hot-dip galvanizing | ✓ Paint and enamel on steel |
| ✓ Plastic coatings | ✓ Hard chrome and metalizing |
| ✓ Electroless nickel (about 8% phosphorus or more) | ✓ Small parts and cylindrical objects |
| ✓ Underwater and wet environments | ✓ Refineries and hazardous areas |
Downloads
| ⬇ Product Literature (PDF) | ⬇ Instruction Manual (PDF) |
About DeFelsko
DeFelsko Corporation of Ogdensburg, New York, manufactures hand-held, non-destructive coating test instruments. Its range covers coating thickness, surface profile, environmental conditions, adhesion, gloss, ultrasonic wall thickness, hardness and holiday testing, all built for accuracy, durability and ease of use.
Manufactured by
