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Counts with switched power: Records hours whenever the chosen 4.5-90 V DC circuit is live; use a feed synchronised with equipment or component operation Six-digit total: Measures 0-999,999 hours; shows 0.1-hour steps to 99,999.9 and whole hours from 100,000; each 0.1 hour equals 6 minutes, so short operating cycles build up before the display changes Retains the total after switch-off: The reading is saved when external power is removed; the LCD uses ambient light for viewing; a flashing hourglass confirms counting C-terminal reset: Fit the reset lead or switch before power-up; while counting, briefly connect C to the terminal marked minus, then release the switch or disconnect the lead; counting restarts at zero Panel fit: The round body is 60 mm in diameter and 49 mm deep, with a 43.5 x 39.5 mm chamfered rectangular cut-out; check panel thickness, rear clearance, connector fit, and polarity; IP65 front face; dry rear wiring area