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Gold Line ZM-1 ZM1 Impedance Meter With Calculated Watts, New Old Stock. Gold Line ZM-1 ZM1 Impedance Meter With Calculated Watts. Appears to be unused but is old stock. Still has protective sulaphane membrane on front and back. Does not include test leads. Modual only. If you are not happy with the meter or don’t agree that it’s new I will happily accept a return and refund your money. What you see in the photos is what you will receive.