ENM’s Series T51 (AC) and T41 (DC) Hour Meters are low-cost reliable hour meters incorporating the latest state-of-the-art in electronics. Its quartz-crystal time base insures accurate long-term timekeeping. A reliable electromechanical wheel-type indicator is used to store accumulated hours. This compact tamper-proof meter is sealed against the environment to provide years of service. The T51 & T41 elapsed time indicators were designed for use on test and recording equipment, for providing maintenance control, for establishing warranty programs, for measuring machine utilization and production time, or for any application where time-in-use is to be determined. Accumulated hours are stored in the mechanical indicating counter, therefore no battery is required to maintain elapsed time.