High accuracy coating thickness gauge with cabled probe, 50 place memory, statistics and colour LED display. Case, test blocks and calibrated test shims included.

  • The FN Ext Paint Thickness Gauge
  • Detachable dual FE/NFe sensor cabled probe
  • Hard-shell carrying/storage case
  • User manual (English)
  • 4x AAA alkaline batteries
  • 2x Substrate test pieces (1 x steel and 1 x aluminium)
  • 5x Plastic calibrated thickness test shims

In Stock (Available to ship worldwide from the UK)

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The FN Ext 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 Ext offers a selectable continuous 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.

The FN Ext’s measuring probe is 1.1cm in diameter, 6cm in length, and is on a cable 90cm long.  The metal sensor tip on the end of the probe is 2mm in diameter.

Click here to read detailed Technical Specifications.

  • High accuracy – the highest rated accuracy and resolution of our coating thickness gauge models
  • Cabled probe – allows reach into narrow and intricate areas to take measurements
  • Reads coatings on thin substrates – Underlying metal thickness of 0.4mm and upwards
  • Continuous reading setting – selectable on/off to allow probe to be held and moved along a surface without lifting
  • 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
  • Adjustable brightness large colour LCD display – for clear, error free readings even in dimly lit environments
  • 50 place memory – automatically stores most recent measurements
  • Statistics calcuation – automatic display and calculation of average, minimum, maximum, and standard deviation
  • Scrollable menu system – for intuitive operation
  • V-notched probe – eases reading on curved surfaces
  • Plastic probe surround – assists in protecting surfaces from damage
  • Metric and Imperial units supported (µm/mil)

µm (aka micrometer or micron = 1/1000mm) and mil (aka Thou = 1/1000 inch)


0 to 1,250µm, 0 to 49mil


0.1µm, 0.1mil


±(2µm+2%), ±(0.1mil+2%)

Sensor type

Combined Ferrous and Non-Ferrous

Measuring technology

Magnetic induction and eddy current


180g (including batteries)


4 x AAA


CE approved, ISO 2178, ISO 2360


166 x 68 x 30 mm

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