 | | | | Hour Meters |  | | | | | Based on the mains or quartz frequency, to record duration of use, or the cumulated hours of operation. | |
| | | | | Electromechanical
| | | From the smallest micro-counter on a printed circuit board, registering operational hours of the equipment, to the well known flush mounted square display unit. | |  |  |
| | | | | Electronic
| | | Display in hours or in h,min,s; with or without reset, or with 1 or 2 presets for applications as digital timer. | |  | |
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