Hengstler 633 Counter, 7 Digit, 5 → 12 V dc

Internal electronic circuit generates pulses every 36s for metering
Metering may be interrupted without losing unrecorded time (since last pulse)
Operating temperature -10 to +60°C
IP65 environmental rating
5 - 12 Vdc operation; may be operated at higher supply voltages by adding external components