FN CM Coating Thickness Gauge

FN CM Paint Thickness Gauge
Factory calibrated:
The FN CM comes factory calibrated, tested, with batteries fitted for immediate use right out of the box!

The FN CM gauge features a cabled probe for reaching into narrow or confined spaces where a gauge with an integrated probe cannot fit. It also possesses the highest rated accuracy, and the highest precision readout of our gauge models (to 0.1µm). Gauge functions are accessed through a user-friendly scrollable menu system.

It has a rich feature set and an adjustable brightness multi-colour LED display that is easily readable even in dimly lit conditions. It includes features from our FN Evo coating thickness gauge, having both a memory and statistical functions. It is high spec and quick and easy to use - simply hold the sensor against the surface to be measured and the coating thickness is automatically displayed on the large colour LED screen.

In addition, the CM offers a selectable continous reading setting where the probe can be held and moved along a surface. This is in addition to the normal single reading setting where the probe is placed on the surface and removed to take one reading at a time.

The gauge also automatically calculates and displays statistics of minimum, maximum, average, and standard deviation of the thicknesses read.

Our paint thickness gauges are high specification, professional grade measuring devices suitable for consumer and commercial use. The FN CM is suitable for a variety of end uses in a range of settings, including the following:

  • Fabricators
  • Engineering companies
  • Aerospace and shipbuilding companies
  • Auto dealers and inspectors
  • Bodyshops
  • Powder coaters
  • Painters
  • Coating inspectors
  • Car detailers
  • Used car buyers
  • ...and other situations where accurate measurement of coating thicknesses on metal substrates is required
Dual probe technology measures coatings on both ferrous and non-ferrous metals:

Unlike lower specification gauges, the FN CM has the ability to measure coating thicknesses on ferromagnetic (e.g. steel) and non-ferromagnetic (e.g. aluminium) metal substrates via its integrated dual sensors, which increase compactness. They automatically detect the substrate metal type and use the appropriate measuring technology (magnetic induction or eddy current) to calculate the coating thickness, reducing user burden and increasing efficiency. Inferior gauges are limited to measuring on either ferromagnetic or non-ferromagnetic substrates, or require manual removal and switching of sensor type and selection by the user.

  • Magnetic Induction
    Measures thickness of non-magnetic coatings (e.g. paint, plastic, enamel, rubber, powder coating, zinc chromium, copper, tin) on ferromagnetic metal base (e.g. iron, steel)
    Examples: Paint on a steel car body (most cars today). Powder coating on steel railings. Vinyl wrap and paint thickness on a car body.
  • Eddy Current
    Measures thickness of electrically non-conductive coatings (e.g. paint, plastic, enamel, rubber, powder coating, anodising) on non-ferrous metals (e.g. aluminium, brass, zinc).
    Examples: Paint on an aluminium car body (e.g. Ferrari 360, Jaguar XK8, Audi A8). Powder coating on alloy wheels. Vinyl wrap and paint thickness on a car body.

Feature rich:

The FN CM gauge is fast and easy to use - simply hold the cabled probe sensor against the surface to be measured and the coating thickness is automatically displayed on the gauge's LED screen. The device is a feature rich, high specification, high accuracy measuring device.


Measures on steel? Yes
Measures on aluminium? Yes
Measures on cylindrical surfaces? Yes (v-notched probe)
Cabled probe with auto selection? Yes
Auto measure when placed on surface? Yes
Reading memory? Yes (50)
Auto store readings to memory? Yes
Statistical functions? Yes (max, min, mean average, standard deviation)
Backlit screen? Yes
Range: 0-1,250µm, 0-50mil
Minimum resolution: 1µm (1/1,000mm)
Connect to PC and download readings? No (Our 156 USB gauge has this feature)

Types of coating that can be measured:

Paint Yes
Powder coat Yes
Fire resistant paint Yes
Rubber Yes
Plastic Yes
Enamel Yes
Vinyl Yes
Zinc plating on steel Yes
Chrome plating on steel Yes
Anodising on aluminium Yes
Any non-magnetic coating on ferrous substrates
(e.g. steel)
Any electrically non-conductive coating on non-ferrous substrates (e.g. aluminium): Yes
* Coating thickness may not be measurable on some grades of stainless steel

Technical specifications:

Units: µm (aka micrometer or micron = 1/1000mm) and mil (aka Thou = 1/1000 inch)
Range: 0-1,250µm, 0-49mil
Resolution: 0.1µm, 0.1mil
Accuracy: +/-(2µm+2%), +/-(0.1mil+2%)
Sensor type: Combined Ferrous and Non-Ferrous
Measuring technology: Magnetic induction and eddy current
Dimensions: 166 x 68 x 30 mm
Weight: 180g (including batteries)
Battery type: 4 x AAA
Standards: CE approved