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I had purchased a new generator from Amazon and wanted to put a hour meter on it. While searching on Amazon, found this one, to connect it all you had to do was wrap the connecting wire around the spark plug wire. I had never seen this, so ordered and so happy I did. Easily installed and works very good.

and it's not supposed to measure revolutions FYI.Got this to record the running time on my snowblower. Just wrap one end around the spark plug wire snugly, use the enclosed zip time to fasten the loose end to the longer part. You then push the other end of the wire into a slot on the back of the unit itself. It's tight but it does fit.Then either use the sticky pad (or drill holes into your sheet metal frame--no way would I do it this way), afix the unit to the frame and start 'er up.The flashing icon (arrow in pic) starts flashing and after 5-6 min, the timer will start showing elapsed time. I measured this on my lawnmower and it works as described.No battery needed as it's self-contained--non-replaceable from what I can see.Downside?1)You can't reset to zero if you change machines. Still have to keep some sort of record after the initial install.2)The wire is fairly short so depending on where your spark plug is AND where you want to attach the unit, it may not reach. It is ~ 42" which may seem long initially BUT once you wrap one end around the wire 5-6 times and fasten it with the zips, it may not reach where you need it to be placed. For example, it does NOT reach any spot on my lawnmower except the tubing (so no flat spot). It DOES reach on my snowblower though. YMMV. Seems to be a fairly standard strand-type wire (no idea of gauge) so an alternate longer wire might be able to be substituted if needed. THAT is just a guess though.Not a downside but an FYI:3) If you read the description, it does NOT measure revs as that requires a different type of measurement device. But then you already knew that before ordering ;-)5* cuz it does what it's supposed to do--->measures RUN time in hours (and tenths of hour).

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Ce compteur est simple à installer, il suffit de fixer le câble antenne au fil de bougie.Seulement, ce câble est trop court pour fixer le compteur sur la poignée de ma tondeuse, j'ai donc du le fixer au double face directement sur le moteur (en attendant de trouver un câble plus long).Le compteur est allumé en permanence et affiche le cumul de temps en heures.La batterie CR2430 est remplaçable.

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