Eccentric wheel: Wet film thickness measurement
How to Measure Wet Film Thickness using Eccentric wheel


  1. What is the name of this equipment?
    • Ans:
    • Eccentric wheel (Wet film thickness measurement Guage)
  2. Why must we always use this equipment during paint application?
    • Ans:
    • Wet film readings should be taken immediately after application, in order to obtain true readings. WFTs can be measured by using either an eccentric wheel, or comb gauges.
  3. This equipment can use on curve surface? How to use?
    • Ans:
    • It should be noted that the eccentric wheel could only be used on flat plate. On a pipe, for example it would be used circumferentially.
  4. Please describe how to use this equipment?
    How to get the reading of WFT? Please describe?
    • Ans:
    • Hold the wheel by its central spindle, using either a finger and thumb or a wet film wheel handle.
    • When placing the wheel into a wet film, it should be placed down evenly, with the maximum scale reading positioned closest to the substrate.
    • Gently roll the wheel along the coated substrate, either through half a rotation (180 degrees), or one complete rotation (360 degrees), depending on the standard being used, and remove from the surface.
    • When the central wheel reaches the thickness of the coating, it touches the paint and is “coated”. To determine the wet film thickness, locate the first point of contact of the paint on the central wheel, which is closest to the wheel’s maximum value, and read the thickness from the scale on the outside of the wheel.
    • When placing the wheel into a wet film, it should never be placed down with the zero closest to the substrate; as the coating film tension will pull the paint up the wheel, resulting in an inaccurate reading.

How to Measure Wet Film Thickness using Elcometer Wet Film Eccentric Wheels

The Elcometer 3230 Wet Film Wheel is a high precision, accurate and easy to use instrument which measures the wet film thickness of coatings.