Purchased to measure rpm’s on a lawn tractor. This couldn’t be easier to install, works great, has instructions, and multiple features besides tachometer. Once you fire up an engine, it powers on automatically. My only criticism, is that you have to power it down manually by holding both buttons otherwise it appears to remain on indefinitely, draining the oversized watch battery that’s in it. Very pleased with it, and is quite affordable.

I was a bit hesitant to purchase these tacho/hour/maintenance reminder meters. I felt there was too much functionality for how they are priced. However, I really got tired to taking a stab in the dark as to when maintenance was required for my small engines on my portable generator and power reel mower. Now that they are installed I absolutely would not give them up - even if you're just looking at the engine speed.Setup: I used the adhesive backed hook and loop mounting arrangement that was supplied with the units. I didn't feel like drilling and tapping two small holes for the meter so I took the easier route. I cleaned the back of the meter with a pre-soaked (no alcohol - just soapy grease cutter version) shop towel and attached the fabric with the battery access cutout. It's 3M adhesive on the hook and loop so it's not coming off anytime soon. The coin-cell battery is preinstalled but you have to unscrew the cover and remove the isolator (a piece of plastic) so the battery makes contact with the tabs on the circuit board. No different than replacing a coin battery for any other device except the packaged versions have a sticker you have to remove. Once it shows that it's on your ready to program.Programming: I didn't have to make any changes to the presets but don't assume you won't. It all depends on your engine and the instructions are pretty clear on how to cycle through the steps. I did play around with it a bit just so I don't have to pull out the instructions that I will eventually misplace or lose. But, take your time and you will be rewarded on the first try.Installation: I cleaned off a spot on my equipment and placed the other part of the hook and loop on an area where I could get to the unit without performing any acrobatics and unfolded the spark plug cable (you can use two methods for sensing the spark - I won't go into details here because it's clear in the instructions). I decided to use the "wrap around the spark plug cable method" because I didn't want to d**k around with the ignition coil. My method was to zip tie the meter cable to the housing part of the spark plug wire (the part that attaches to the plug) and then make 5 turns around the cable then zip tie the trailing end of the meter wire to the spark plug cable. Make sure your turns are tight around the spark plug cable and bunched together in one layer - take your time because making sure the induction lead (meter cable) is wound tightly is important. With a pair of diagonal cutters or very sharp scissors cutoff all but 2-3" of the trailing meter lead (just in case you have to redo it and need a little extra in the future.Operation: Nothing to it here. Once I started the engines the unit automatically started reading the speed in RPM - kinda nice to see when you haven't seen it before - it's the small things that excite me. I checked my instruction manual and the meter indicated what the manual stated - give or take a few RPMs but nothing major. For example, full speed on my generator engine is 3600 RPM. The meter was reading 3590 - 3610 RPMs. I consider that a success.Cleanup: I placed some zip tie bases in a couple of spots so the meter lead would stay clear from the hottest part of the engine. But, keep in mind it is an air cooled small engine (speaking only for my two) after all and they are built tightly with only a bit of space in order for the internal vanes to push air over and around the engine.In Closing: Nothing major to discuss here but keep in mind the following: 1. Take your time (it took me roughly 30 minutes for the first one and no more than 15 minutes for the second install), 2. If you know the characteristics of your engine program the meter prior to installing it, 3. If you can avoid it try to keep the actual meter away from the hottest parts of the engine, 4. Make sure your meter lead is tightly bunched and wound, in one layer, around the spark plug cable, 5. Start your engine and enjoy the view, and lastly, 6. Go enjoy a cold, frosty beverage - mine is 60% Simply Lemonade and 40% Gold Peak sweet tea - my version of an Arnold Palmer.

Received mine today. I plan to use it on my chainsaws to measure rpm, but I didn’t have them available. So I tested the tach on a Honda generator that is rated at a 4300 rpm engine speed. The engine is a single cylinder, 4-stroke, but the setting for that gave me twice the rpm (8600) when I tested it. The instructions do say that some 4-stroke engines actually use the single cylinder, 2-stroke setting, so I tried that and got an engine speed of 4300! So, I’d say this tach is very accurate. Just make sure you use the proper setting.For my initial test I wrapped the wire around the spark plug cable per the instructions. Big PITA! Then I connected the wire to an alligator clip (much easier!) and got the same 4300 rpm reading. So, it appears a clip works just fine.The instructions say that zip ties are supposed to be included in the box. I didn’t get any. No big deal, but poor quality control, I guess.So far, I’m satisfied, and I’m hoping for a good service life on the tach.Note: while I have it out of use, I keep the battery out.

Works great and as described. Easy to install I would suggest using screws to hold it on but the 3m tape is good to start. very durable looks great and fits the location I needed it to.

Purchased this to put on my new Wood Miser band saw mill. Helps keep up with the engine hours so I will know when to service the engine. Works as described.

This product works well, I think. It is easy to hook up and read the display, however two things I really disliked about it.1) the battery cap is very weak, doesn't latch well, and is kind of hard to get seated without going past the seated position and having it fall off. It works, you just have to fiddle with it2) In the manual, it states that if the RPM is reading a couple hundred RPM too high or too low, to add or remove a wrap around the plug wire. I am tuning a chainsaw. How in the world would I know if the RPM displayed on this is off, the chainsaw has no tachometer. It's literally the reason I bought this product, which now tells me it might be off by a few hundred RPM. If the device you plan on hooking this up to has an accurate tachometer, why would you be buying this?I do believe with 5 wraps it was close to accurate and was very helpful in tuning my saw, but these two gripes were my concerns. It is probably worth the price but if you need accuracy, I wouldn't recommend this.

I installed on a Pulsar GD400BN generator, I used the 1P1R firing pattern and wound the wire five loops around the spark plug cable.I set the service timer reminder at 50 hours and confirmed with my watch that the running time was working properly it showed .4 hours and my watch said 25 minutes I consider that very accurate.The RPMs were as follows: 3,260 on low idle, 3,370 high speed no load, with a 2,230 watt load the RPMs were 4,270. The generator user manual states 4600 RPMs is the maximum for this engine at full load which is 3,000 running Watts, I am comfortable with the readings I'm getting they may not be exact but they are very close to exact, later on I will purchase a Briggs & Stratton manual tachometer and I will verify if these numbers are right on the money.The directions are correct although at times a bit vague and the font is tiny and it was very difficult for me to be able to read it.I am very pleased with the device, the fact that it came with a battery that is replaceable and the fact that I can turn off the display when I'm not using it, I recommend it.

Wired in unit, set up for engine, started engine, all good. Returned 1hour later, started engine, the digits cycle randomly, doesn’t work & continues not to work. Ordered another from elsewhere.

Fa quello che promette e sembra(miracolosamente)farlo bene. I giri stimati sembran plausibili.non ho notato differenze in tal.senso aumemtanso o diminuendo il numero di spire. Il funzionamento é semplice, sul sito del produttore trovare le istruzioni in pdf..l autonomia(sulla carta)é altissima, solo la guarnizione del vano che la contiene mi lascia perplesso sulla effettiva impermeabilità. A didferrnza di altri si azzera, potete scegliere il promemoria della manutenzionene se vedere sempre il conta ore al posto del conta giri o vedere le ore solo a macchina spenta..ad ora nn ho davvero nulla da volere in più!

Gummidichtung für Batteriefach war bei Ankunft bereits verklemmt und ergo beschädigt. Damit ist das Fach nicht mehr wasserdicht. Kann passieren, für mich war das keine Voraussetzung beim Kauf also egal und ist ausgenommen von der Gesamtbewertung.Inbetriebnahme und Einstellungen sind rudimentär aber ausreichend und zweckdienlich. In der Preisklasse darf ich nur beurteilen, ob das Gerät den Angaben entsprechend funktioniert, alles darüber wäre vermessen zu erwarten.Ich habe keine Möglichkeit die Genauigkeit des Gerätes zu prüfen aber das Gerät ist funktionstüchtig und angezeigte Daten scheinen glaubwürdig. Schnelle Lieferung und gratis Versand nach Österreich ... 5 Sterne und ein Dankescön

Funziona bene.Peccato non si possa spegnere completamente.

mein "Oldtimer" kam mehr als 20 Jahre ohne Drehzahlmesser aus.Ist nicht Zeitgemäß für das Baujahr, aber funktioniert