Product review (5 stars): A really good buy
I have four of them now. Each has functioned perfectly in the months I have had them. I also have a much more high end version by a big name company. The readings are always the same. I read the negative reviews before my purchase but the price was so good I said why not. The only trick is figuring out how to install the first battery. PS I only bought one unite at first and after a couple of months I purchased the rest.