... mode and auto shutoff mode; 3,spec parameters Type of Gaging HeadFNOperation PrincipleMagnetic InductionEddy CurrentMeasuring Range(Hm ... , steel and other magnetic metalsF-type Probe Measuring Range: 0Hm~1250Hm F-type ProbeMeasuring Range: 0Hm~1250HmSuch as copper ... , aluminum, brass, zinc, tin and other nonferrous metalsN-type ProbeMeasuring ...