... substrate (such as iron, steel, etc.) coating measurement, LCD clock display "Fe"CM8801N: NFe type: Suitable for inter permeability substrate ... substrate (such as aluminum, etc.) coating measurement, LCD always display "NFe"CM8801FN: Complex type: Suitable for all metal matrix ... coating measurement, depending on the substrate may be, LCD will display "NFe" or "Fe", type of instrument can automatically ...