Product review (2 stars): It does what it does
I purchased this device to calibrate some of my electronic weather stations. After using the values on this devices to calibrate my devices, they are now predicting weather more accurate than before. It takes about five minutes to read the ambient temperature, but that is normal.
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After using several time to calibrate my weather station. I conclude that this product is not performing at it should be. At one point, I set the weather station to the humid level that was 10 point higher than sensor reading, then the weather station predicted rain during 3-4 sunny days. It couldn't possibly predict 4 days in advance. Finally, I gave up and use the number that the weather station reports, and the weather station is back to normal. I lower to 2 stars for this device, because at least it reports correct temperature.