Make sure the surface to be measured is clean and free from oil and grease. Hold the PosiPen at a right angle to the surface to be measured. Place the tip of the gauge on the coated surface and allow the magnet to contact.
Pull it straight back from the object while keeping close watch on the appropriate indicator. Note the reading when the magnet releases. Repeat if necessary.
Models A and B have two scales, microns (metric) and mils (inch)
Range: 0.25 to 20 mils (inch)
Tolerance Â±10% and 0.1 mil
Range: 5 to 500 microns (metric)
Tolerance Â±10% and 2.5 microns
Models A and B are calibrated to NIST calibration standards.
Some objects become excessively magnetic. For example 300 series stainless steel is non-magnetic but becomes
magnetic over time. Certain welding seams become magnetic compared to the surrounding metal. Model C allows you to
compare ferrite content to a known value.
Model C has two scales:
Ferrite content measuring range: 0-10 linear units to compare Ferrite content to an known value
Coating thickness measuring range: 0.25 to 20 mils (inch scale) Tolerance: +10% and +0.1 mil