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Runtime record: NInE-ROnG IP68 hour meter records 0 to 99,999 h; saved total helps plan oil changes, filter service and seasonal maintenance Spark plug sensing: Pickup lead reads ignition pulses from petrol engines; no cutting into harnesses or external power connection Simple fitting: Wrap the 1.1 m lead about five turns around the spark plug lead near the cap; move closer if the hourglass icon does not flash Outdoor sealed body: IP68 housing helps resist rain, splash, dust and vibration; leave 8 cm slack and keep the lead away from hot or moving parts Petrol engine fit: For two-stroke and four-stroke engines on boats, petrol outboards, jet skis, personal watercraft, snowmobiles, snow blowers and winter machines; not for diesel