Review on AGPtek® Professional Digital Tachometer Contact by Andrew Jones

Yes it's Chinese. No, it's not the best tool for the job. However, at this price point and for what I needed, it fit the bill perfectly. Pros: Inexpensive, fairly accurate, lightweight, and small enough to fit in tight spaces. In addition, the results are repeatable. just not consistently. It's a wearable device, so handle it. For those who say the battery connector needs a polarity mark. It's a 9 volt battery, there's only one way to connect it. For those who say the tape doesn't stick. it will not stick to rust, oil, diesel fuel, mayonnaise or butter. Use sandpaper or a file to get to the bare metal and it will adhere perfectly. Incidentally, the packing tape does not stick to the above-mentioned surface either. Cons: The only reasons I didn't give this 5 stars are: 1) You have to fiddle with the battery connector to get the cover to slide properly. and 2) I encountered a few faint events during testing and 3) if I have to remove the battery after each use, there will likely be a connector failure at some point. All in all a cheap device that does what it is supposed to do. make . for the non-professional amateur. I would definitely recommend it for any use outside of work or for light use in the home garage.