I can not understand the negative reviews. I was skeptical but I needed to complete this order as cheaply as possible. I bought this feeling that I will no doubt have to replace it shortly after purchase. But at this price I thought it was a "throw away product" and wasn't worried. Without going into unnecessary detail, my contraption withstands terrible insults. It is regularly tested against two analogue standards and performs much better than expected! It has always delivered flawless performance on all four channels. Because all four sensors are identical, each reading at the same location will be the same (subject to unity tolerances listed). It may be due to a lack of quality control, which is lucky for me and others may not be so lucky. But now I need a second device and will buy another one. Let's see how I can do it. Edit: Bought a second block. Six months in use, perfect, like the first. Remember that the second device was purchased more than a year after the first. If there was a quality control issue, I would most likely see a problem with one of the two devices. This leads me to believe that negative reviews about this product should not be taken seriously. Edit: Years of daily use, both go strong. These units are severely punished and continue to operate. Highly recommended! EDIT: Three years later, both are working fine. Better yet, compared to their much more expensive counterparts, these devices proved to be more accurate. More stable compared to analogue standards.
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