Measuring Paint Thickness on Steel 0:21
Learn the benefits of and how to use IMO PSPC 90/10 mode with the PosiTector 6000 Advanced Coating Thickness Gauge for ALL Metal Substrates in a step-by-step guide.
Magnetic Pull-Off Coating Thickness Gauge
The PosiTest is a mechanical, magnetic pull-off gauge built for fast, direct readings of coating thickness on steel. It features a rare earth permanent magnet that resists drift over time, a large dial for easier reading, and a mechanism that holds the reading after the magnet separates from the surface—making it far easier to view and record results.
As with all our DeFelsko instruments, your PosiTest from DFT Instruments is supplied with calibration, warranty, and local UK support to ensure performance that’s reliable and inspection-ready.
Features
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Ultra-Durable Probe – Precision carbide-tipped sensor delivers exceptional wear resistance for long service life and consistent accuracy.
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Tough, All-Weather Body – Extra-rugged housing shrugs off mechanical shock and is unaffected by water, acids, or common solvents.
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Stable, No-Pivot Design – The gauge’s fully supported structure ensures firm, positive placement on the surface with no rocking or pivoting during measurement.
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Clear Feedback – Distinct visual and audible cues confirm the exact moment a valid thickness reading is captured.
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Built-in V-Grooves – Machined grooves in both the probe housing and gauge base help achieve precise alignment on pipes, tubes, and other curved parts.
Why Measuring Matters
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True Coating Deposition
Pull-off measurements give you thickness values representative of how much coating is actually adhering—excluding trap-out or surface irregularity. -
Durability Over Time
The PosiTest’s rare earth magnet and mechanical design mean little risk of drift even after long periods of storage or infrequent use. -
Ease of Inspection
Holding the reading after the magnet pulls lets inspectors get cleaner results, particularly in difficult viewing angles or tight spaces. -
Ideal for Field Use
Works without batteries or electronics, so it’s rugged, reliable, and suited for environments where power or delicate equipment is a liability. -
Compliance & Traceability
Meets relevant standards for magnetic pull-off coating thickness; suitable for quality assurance, audit, and ensuring coatings meet specification.
Why Choose DFT?
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Decades of Experience – Since 1998, DFT has supplied quality inspection instrumentation across the UK & Europe, developing hands-on expertise in coating measurement.
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Authenticity & Warranty – We supply genuine DeFelsko PosiTest gauges, fully backed by manufacturer warranty and spare part support.
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Certified Calibration Included – Every gauge is supplied with a Long-Form Calibration Certificate traceable to PTB/NIST.
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UK Based Support & Repair – Local service centre ensures fast turnaround for any repairs or recalibration, minimizing downtime.
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Technical Guidance – Advice on best use (how to perform pull-off tests, selecting the right stand-off / probe, interpreting results) from people who know the devices and applications.
Helpful PosiTest Videos
Coating Thickness 4:27
A really helpful video to show an overview of the DeFelsko coating thickness gauge range.
Features & Benefits
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Large dial with high spring pressure for more distinct magnet pull-off.
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Reading remains visible after pull-off, allowing easier recording.
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Rare earth permanent magnet provides consistent magnetic force with no drift.
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Rugged, corrosion-resistant brass body for harsh environments.
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Measurement possible even on hot surfaces (when properly handled), subject to allowable ranges.
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Can be used underwater (fresh or saltwater), cleaned after use in saltwater.
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No batteries or electronics required — mechanical operation ensures simplicity and reliability.
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V-Groove probe/contact area helps on curved surfaces like pipes or tubes.
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GO/NO-GO settings (on some models) for rapid assessment.
Technical Specifications
| Specification | Details |
|---|---|
| Measurement Range (Dial) | Varies by model — typical ranges cover small to moderate coatings (e.g. 0-200 µm / equivalent mils) [depends on model version] |
| Accuracy | Precise dial mechanism; avoids drift thanks to permanent magnet construction. Manufacturer lists standards compliance. |
| Dial Hold | The gauge retains the reading after pull-off for easy viewing. |
| Temperature Capability | Can measure on surfaces from about −50 °C to +100 °C / −58 °F to +212 °F when conditions permit. Instrument body must remain within its safe operating temperature. |
| Construction | Corrosion-resistant brass, durable mechanical parts; no electrical components. |
| Standards | Meets or conforms to relevant magnetic pull-off coating thickness standards. |
Model Options:
| Model | Best For |
|---|---|
| PosiTest F (Standard dial range) | Everyday steel coating inspections, quick QA checks |
| PosiTest F-High Range | Thicker coatings where standard version might max out |
| PosiTest F-Special Version | Custom ranges or GO/NO-GO gauge settings for specific spec |
(Note: model names and ranges are illustrative; check with DFT for exact stock & range options you need.)
Probe Interchangeability
FAQ’s
How is the PosiTest different from the PosiPen?
PosiTest uses a larger dial, higher spring pressure, and retains the reading after pull-off. The PosiPen is more compact and suited to tight or hot spots.
Does the PosiTest drift over time?
Very little. Its rare-earth permanent magnet means magnetic strength holds steady. Mechanical parts may need occasional check, but it’s far more stable than many magnetic gauges with adjustable magnets.
On what kind of surfaces can I use it?
Steel surfaces primarily. Curved parts are fine using the V-groove probe. Hot surfaces can be measured if the gauge is handled properly and within temperature allowances.
Can I use it underwater or in salty environments?
Yes, the brass construction permits immersion; saltwater residues should be rinsed off with fresh water after use to maintain longevity.
Do I need batteries or electronics?
No. The PosiTest is entirely mechanical—no batteries or hull-over electronics. That makes it very rugged.
Is training required to use it?
No. The PosiTest DFT is designed for simple operation. DFT’s UK support team are available for guidance if required.
How do I read it accurately?
Ensure the dial is read when the magnet releases, use the preserved reading function, and subtract any base metal roughness (using base metal reading) especially on rough steel surfaces.
Still need help?
If you experience an issue, check our troubleshooting guide or contact our support team directly. As a DeFelsko Authorised Service Centre (DASC), DFT Instruments provides calibration, repair, and technical assistance locally in the UK.
Find out more about the PosiTector 6000 and all the features that come with it
What’s Included:
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PosiTest Magnetic Pull-Off Gauge (model range as ordered)
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Carbide-tipped probe, pre-installed and factory-calibrated
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Long-form Certificate of Calibration traceable to PTB/NIST
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Protective hard-shell carrying case for safe transport and storage
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Zero reference plate and plastic shims for verification checks
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Operating instructions & quick-start guide
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2 year manufacturer’s warranty for peace of mind
For reliable, battery-free thickness checks that last, the PosiTest Magnetic Pull-Off Gauge is your go-to. Supplied by DFT Instruments with full calibration, warranty, and UK support.
📞 To enquire about this product, contact our team today on: 01442 879494 or Complete the form.