Trumeter 722 Series Hour Meters The 722 series of Hour Meters have an operating range of 9-264V ac 50/60Hz. Models are available in the standard industry housings and are quartz time based to ensure accurate long-term time keeping. The totally sealed cases of these Hour Meters protects against the environment and provides years of reliable service. 6 Figures 3.6mm high Operating voltage 90-264V ac Totally sealed Non-reset Clip or mounting holes Quartz accuracy Minimum 36 second on-time for event capture NEMA 4x rated