I bought one of these for myself maybe 4-5 years ago and was very happy with it, but when I recently got two more for my employer I noticed that they are not manufactured to the same quality standard. I immediately noticed a rougher finish and sharper edges, and after using them for a while it was clear they didn't perform as well as my older pair. The most annoying thing is that they sometimes reset themselves and give false readings when I'm not noticing. The screw to tighten doesn't stay tight either, and components like the battery holder don't fit properly, so one side of the sensor doesn't give accurate readings.