Coating thickness gauge with 5mm range, 2,000 place memory, and statistics. Cabled probe. Case, test blocks and calibrated test shims included. Ideal for intumescent paint thickness measurement.

  • The FN Max Ext Paint Thickness Gauge
  • Hard-shell carrying/storage case
  • USB lead
  • CD with software (Windows XP/Vista/7/8/10)
  • User manual (English)
  • 2x AAA alkaline batteries
  • 2x Substrate test pieces (1 x steel and 1 x aluminium)
  • 6x Plastic calibrated thickness test shims

In Stock (Available to ship worldwide from the UK)

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The FN Max Ext gauge has the highest range of all of our coating thickness gauge models, reading coatings up to 5mm thick.  Whilst it can measure the thickness of many types of coatings and paints, this makes it ideal for measuring thick coatings such as intumescent paint.

The cabled probe on the FN Max Ext model facilitates taking measurements in narrow areas compared to a gauge with a probe integrated into the gauge body.  It also allows for the LCD display of the gauge to always remain facing and visible to the user.

The FN Max Ext has a rich feature set and a backlit LCD display that is easily readable even in dimly lit conditions. It features 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 screen.

The gauge also automatically calculates and displays statistics of minimum, maximum, and average of the thicknesses read. It is supplied with a USB cable and software to allow measurements to be downloaded to a PC.

The minimum specified measuring area for this gauge model is 20mm in diameter.

  • High range, measures coatings up to 5mm thick
  • Cabled probe – allows reach into narrow and intricate areas to take measurements
  • Download readings to a PC with included software and USB cable
  • Auto measure – simply place the probe on the surface to be measured
  • Auto detection and display of substrate type (Fe/non-Fe)
  • Integrated dual sensors – enables reading on ferrous and non-ferrous substrates with automatic deteiont, no probe switching, and no user intervention
  • Backlit LCD display – for clear, error free readings even in dimly lit environments
  • 2,000 place memory – automatically stores most recent measurements
  • Statistics calcuation – automatic display and calculation of average, minimum, maximum
  • V-notched probe – eases reading on curved surfaces
  • Plastic probe surround – assists in protecting surfaces from damage
  • Contoured fingergrips – enable operation with just thumb and forefinger
  • Metric and Imperial units supported (µm/mil)
  • Slim and lightweight – fits into a pocket and is discreet in usage

±(2µm+3%), ±(0.1mil+3%)


0.1µm (Up to 100µm), 1µm (Up to 1000µm), 10µm (Over 1000µm)

Sensor type

Combined Ferrous and Non-Ferrous

Measuring technology

Magnetic induction and eddy current


110 x 53 x 24 mm


92g (excluding batteries)


2 x AAA


CE approved, ISO 2178, ISO 2360

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