The 3813 is capable of measuring the thickness of non-magnetic materials, (paint, plastic, enamel, copper, zinc, aluminium and chrome) on magnetic materials.
It is often used to measure the thickness of a galvanized layer, lacquer, porcelain, phosphide, copper tile, aluminium tile and some alloy tiles, etc.
The 3813 is also capable of measuring the thickness of non-magnetic coatings on non-magnetic metals.  It is used on anodizing, varnish, paint, enamel, plastic coatings and powder applied to
aluminium, brass and non-magnetic stainless steel.
• Measuring range: 0-40mils (0-100µm) max.
• Resolution: 0.1µm/0.1mils (0-99µm) or
1µm (over 100µm).
• Guaranteed tolerance (after one-point
calibration): ±1-3%n or 2µm (whichever
is greater).
• Minimum measuring area: 5 x 5mm
 (0.20” x 0.20”).
• Minimum radius of curvature:
 Convex: 3mm (0.12”);
 Concave: 30mm (1.2”).
• Minimum substrate thickness:
 Ferrous: 0.5mm (20mils);
 non-ferrous: 50µm (2mils).
• Zero calibration.
• Foil calibration.
• Maximum surface temperature of test
object: 302˚F (maximum contact time two
seconds).
• Power source: Four AA batteries.
• Includes steel and aluminium substrate
samples.
• Includes four calibrated thickness
samples.
• Dimensions: 161 x 69 x 32mm.
• Weight: 260gms.