Coating Thickness Gauges

Q: What is the difference between magnetic and eddy current measurement principles?

Magnetic principles are used for non-magnetic coatings on ferrous substrates (steel and iron) by measuring changes in magnetic flux. Eddy current principles are used for non-conductive coatings on non-ferrous metal substrates (such as aluminum) by measuring electrical impedance variations.

Q: Do electronic gauges require frequent manual calibration adjustments?

Most modern electronic gauges (like the PosiTector 6000 ) arrive factory-calibrated and ready to measure. Performing a quick zero check on an uncoated piece of the actual job substrate ensures maximum measurement precision before starting an inspection.

ABQ Industrial offers a comprehensive catalog of professional Coating Thickness Gauges (also known as dry film thickness or paint thickness gauges) from industry-leading manufacturers including DeFelsko and ElektroPhysik. Engineered for corrosion engineers, paint inspectors, quality control technicians, and manufacturing plants, these precision instruments provide accurate, non-destructive thickness verification across protective coatings, paints, platings, and linings.

Whether your quality assurance workflow requires measuring organic coatings on structural steel using magnetic principles, testing anodizing or paint on aluminum using eddy current technology, or performing mechanical magnetic pull-off tests in hazardous environments, our catalog delivers the exact accuracy, rugged design, and international standards compliance (ASTM, ISO, SSPC) required for reliable coating inspection.

Coating Thickness Measurement by Substrate & Testing Principle

Selecting the proper coating thickness gauge depends directly on your substrate material (ferrous metals vs. non-ferrous metals) and required measurement range:

Ferrous Metal Substrates (Steel & Iron - Magnetic Principles)

Measuring paint and protective coatings over carbon steel or cast iron structures is the most common application in structural steel fabrication, bridges, and oil & gas pipelines.

Target Substrates: Carbon steel, structural iron, and magnetic stainless steel.
Recommended Solutions: The rugged DeFelsko PosiTector 6000 Ferrous Models (offering fast electronic measurement up to 250 mils / 6 mm) and the economical DeFelsko PosiTest DFT Ferrous Coating Thickness Gage for routine spot checks.

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Non-Ferrous Metal Substrates (Aluminum, Brass & Copper - Eddy Current Principles)

Non-ferrous metals require eddy current technology to measure non-conductive coatings accurately without interference from the underlying metal base.

Target Substrates: Aluminum, brass, copper, and austenitic stainless steel.
Recommended Solutions: DeFelsko PosiTector 6000 Non-Ferrous Models and combination ferrous/non-ferrous (Combo) gauges that automatically recognize the substrate upon contact.

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Hazardous & Non-Sparking Environments (Mechanical Magnetic Pull-Off)

In explosive atmospheres or remote locations where electronic devices or batteries are restricted, mechanical spring-load pull-off gauges provide dependable, spark-free operation.

Target Environments: Offshore platforms, chemical plants, and hazardous storage tanks.
Recommended Solutions: The ElektroPhysik MikroTest F6 Banana Gauge, an automatic magnetic attraction gauge that operates entirely without batteries.

Coating Thickness Gauge Selection Guide (Featured Models)

Click any model name in the reference table below to view individual specifications, pricing, and ordering options across all active instruments in our Coating Thickness Gauges catalog:

Model / Series Link	Substrate Type	Measurement Principle	Key Features
PosiTector 6000 Series	Ferrous, Non-Ferrous & Combo	Magnetic & Eddy Current	Interchangeable probes, color touchscreen, 250k storage, Bluetooth/USB
PosiTest DFT	Ferrous or Combo	Magnetic / Eddy Current	Compact economical design, fast readings, dual-function V-groove probe
MikroTest F 6 (Banana)	Ferrous Metals	Mechanical Magnetic Pull-off	100% battery-free, automatic operation, ideal for hazardous areas

Key Technical Capabilities Across This Category

Dual Substrate Recognition: Advanced electronic gauges automatically detect whether the underlying substrate is ferrous or non-ferrous and apply the correct measuring principle instantly.
Interchangeable Probes: Modular electronic platforms allow users to swap cabled or integral probes for specialized geometries, high temperatures, or thick protective linings.
Comprehensive Data Management: Built-in memory, statistical analysis, and Bluetooth/USB connectivity enable seamless transfer of inspection data to mobile apps or PC quality software.
NIST-Traceable Calibration: Every instrument ships with calibration shims, a protective holster, and a NIST- or PTB-traceable calibration certificate.

Coating Thickness Gages, also known as Dry Mil Gauges or Paint Thickness Gauges are precision measure instruments that use magnetic and eddy current principles to measure coating thickness on both ferrous and non-ferrous metals. Coating thickness gages measure the thickness of paint plating, coatings and galvanizing on iron steel.

F.A.Q.

What is the difference between magnetic and eddy current measurement principles?

Magnetic principles are used for non-magnetic coatings on ferrous substrates (steel and iron) by measuring changes in magnetic flux. Eddy current principles are used for non-conductive coatings on non-ferrous metal substrates (such as aluminum) by measuring electrical impedance variations.

Do electronic gauges require frequent manual calibration adjustments?

Most modern electronic gauges (like the PosiTector 6000) arrive factory-calibrated and ready to measure. Performing a quick zero check on an uncoated piece of the actual job substrate ensures maximum measurement precision before starting an inspection.

When should I choose a mechanical banana gauge over an electronic gauge?

Mechanical magnetic pull-off gauges (such as the MikroTest F6) operate entirely without batteries or electronics, making them ideal for hazardous, explosive, or spark-sensitive environments where electronic devices are prohibited.