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. PosiPen C allows you to compare ferrite content to a known value.
PosiPen 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