The Feritscope FMP30 uses the principle of magnetic induction to measure the ferrite content in austenitic and duplex steel. The instrument measures all the magnetic components in an otherwise non-magnetic structure. As a result, transformation martensite and sigma ferrite phase are detected in addition to delta ferrite. It offers fast, nondestructive measurement of ferrite content either on-site or in the lab. It has a measurement range of 0.1 to 80% Fe or 0.1 to 110 FN. Corrective calibration with customer-specific standards are possible.