Another difference is that some AC/DC dual purpose clamp type ammeters have a universal AC/DC measurement range. When measuring current with this type of ammeter, it is not necessary to distinguish between AC and DC ranges. As long as the appropriate current range is set, it can be measured. Some dual-purpose clamp ammeters have separate AC and DC measurement ranges. If using this type of ammeter to measure DC current, the range must be set to the appropriate DC current range in order to measure it.