I am trying to pick out a nice dual thermometer/hydrometer on Amazon. But it looks like the reviews mostly say that they are all inaccurate even with the same models side by side. I have 4 of the Flukers hydrometers, the ones shaped in a circle with a needle that points to the percentage. They are all way off from each other even when just sitting in a room all together. Worthless junk. Can anyone recommend an accurate one that covers both temperature and humidity?