... steel, iron, alloy and hard magnetic steel etc.)Measuring Principles: magneticMeasuring Range : 0-1250umMeasuring Accuracy(um) :One ... steel, iron, alloy and hard magnetic steel etc.)Measuring Principles: magneticMeasuring Range : :0-400umMeasuring Accuracy(um) :One ... steel, iron, alloy and hard magnetic steel etc.)Measuring Principles: magneticMeasuring Range : 0-1250umMeasuring Accuracy(um) :One ...