Paint Inspection Gauge
Direct measurement of the total coating thickness or individual coatings eg.
a primer and top coat. Measurements on virtually any substrate are possible;
aluminium, steel, plastic, wood, concrete or glass.
Substrate condition, coating adhesion, microscopic cracking, brittleness,
blistering and intercoat adhesion can also be measured using the built-in 50 x
Principle of Operation
A tungsten carbide cutting tool is used to incise a small precise 'V'-shaped
groove through the coating and into the substrate. The V-groove is viewed
through the microscope and measured using an optical scale.
The body of the P.I.G. is cast from aluminium and contains a microscope, a
lamp and the groovecutting bit. Two legs extend from the unit on the same side
as the cutting bit and are used as stabilizers when making the incision. The
microscope (SOx) has built-in measurement scale with major graduations in 20
The instrument is supplied complete with three cutting tips, a fibre tip pen,
extra batteries and bulb.
||Maximum Coating Thickness
||1 Division on Scale
The measurement principle is based on the geometry of the incision.
- Select a test panel or a site for thickness measurement.
- Using an appropriate marker pen draw a line on the test surface.
- Grasp the gauge and rest the studs and cutting tip on the test surface at
right angles to the marked line.
- Draw the gauge across the paint film, increasing the pressure until the
cutting tip just cuts into the substrate.
- Take readings at the intersection of the marked line and incision. The tip
cuts one 'sharp' edge and one jagged edge. Measure using the optical scale
from the sharp edge of the incision to the next paint layer or substrate.
- The actual coating thickness is obtained by multiplying the observed
optical value by the scale (having regard for the cutting tip used).
Complies with ASTM D 4138 -Method A; DIN 50986; BS3900 part C5/ISO 2808
||Paint Inspection Gauge including 3 cutting tips, batteries,
pen and carry case.
||1 x cutting tip
||2 x cutting tip
||10 x cutting tip
||Cutting tip holder.