Works perfect

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Well made, easy to use, easy to read, works great

This is a neat little tool and if you know how to use it would be very handy to have. The instructions are terrible. I cannot figure out how to set this up for 2 cycle or 4 cycle engines or the number of cylinders.I also asked a question if the battery on this can be replaced. I never received an answer. Upon receiving this, I found the answer is no. If you can’t replace the battery, consider this a disposable tool. Personally, I don’t want to get invested in something like this if it will randomly die at some point and I have to learn something new.Supposedly this will track hours to better manage your maintenance schedule. If the battery dies, what good is it?I can’t believe you are expected to throw this away and buy another one when the battery goes. No thanks. I’m not in the market for this design. Did I mention, the instructions are terrible.It is too much effort for me to try to figure it out.UPDATE - I raised my rating from 2 to 4 stars because the unit works well if you can confirm the modes are set properly. If there is too much confusion due to lack of clear instruction this is useless to the customer. With modern translation tools, there is no excuse for poor instructions.The seller provided the following detail as a result of my comments above. This detail adds more framework around the right selections for your engine:“ Here are some instruction about the tachometer, hope it is help for you. Our tachometer has 4 modes: 01-02-03-04. The 01,02,03 mode is a simple multiplier relationship, and the rotational speed value is doubled. Assuming the same engine and the same idle signal, read in 01 mode, the result is 1000 rpm, then using 02 mode to read is 2000 rpm, and using 03 mode to read is 4000 rpm. 04 is for reset, leave it alone. It's a mistake to think of the 02 mode as a 2-stroke and the 03/04 mode as a 4-stroke. Because some 2-stroke engines are suitable for 02 mode and some 2-stroke engines are suitable for 03 mode, it is not intuitive to use 02 for all 2-stroke engines and 03 for all 4-stroke engines. The general carburetor and motorcycle are almost idling about 1000 rpm, if the EFI motorcycle is about 2000 rpm, the chain saw is generally in 02 mode, and the idle speed is about 3000 rpm. All chain saws are in 02 mode, carburetors/motorcycles are generally in 02 mode, EFI motorcycles are in 03 mode, outboards have their own, generally 01 or 02 mode, EFI (non-gasoline engine) can not be used, diesel engines cannot be used, 2-stroke single cylinder and 2-stroke 2 cylinders are counted as two-stroke, generally corresponding to 01 mode. You should have a certain understanding of your engine, for example, the approximate range of motorcycle idle speed is 1000 rpm, the engine is hot, the tachometer is connected to the spark plug tube, the default is 02 mode, if the readout data is 2000, then choose 01 mode. If the data read by the 02 mode is about 1000 rpm, then the 02 mode is selected. If the 02 mode reads out only about 500 data, then change it to the 03 mode. The reason why we don't use 02 for 2-strokes and 04 for 4-strokes is because there are many unconventional engines on the market, and there is no fixed mode to fit all engines. If you have any questions please let us konw and we will happy to deal with it.”I would still like to see a matrix of settings and scenarios so the user can be clear when setting it up for their 2-stroke, 4-stroke engine and number of cylinders. The verbal description leaves too much potential for confusion.Also, the battery should be replaceable to eliminate waste and allow for the tool to be used longer.

Mode and Set button are not easy to use. Nothing about this item is intuitive or easy to set up. And the included instruction sheet talks about setting but no real explanation of each function.