Trumeter 732 Series Hour Meters The 732 series of DC Hour Meters have an operating range 10-80V dc. They are protected for 2 times battery voltage and/or reverse polarity. These Hour Meters are quartz time based to ensure accurate long-term time keeping. Their totally sealed cases protects against the environment and provides years of reliable service. 6 digits Operating voltage 10-80V dc Totally sealed Quartz accuracy 6 Mounting variations Terminals up, down and straight NEMA 4X protection