This device works well and is very accurate. I bought it to control the temperature of the coil before and after my heat pump. Two things I would improve. First, the lens is pretty soft and I scratched it slightly on day one just by picking it up and clipping it. Novus Scratch Remover removes all but the deepest scratches. I would have thought that this lens would quickly fall apart in the field. However, mine will always be in one place inside now, so that won't be a problem. Second, this thing is hard to hold on to. They fold over a lot of the edges and that makes it a bit slippery. Buy this again, it's the right price and works well. If I were a pro I would look for a device with harder lenses.
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