Product review (2 stars): Don't use Hygrometer function.
So... there's some good and bad with this device. I will end up returning it because of the bad, but it still may be for some people. Over all, however, I would recommend looking for a different product.

The good: I love the size. It's small and compact, perfect to lay down in a humidor corner (actually fit perfectly above some of my sticks and the box). Temperature is also accurate to 1 degree. Large numbers are easy to read. There is no back light, but since I do not check it in the dark this is also not an issue. Build seems decent, should hold up over time if used for what it is made for.

The bad: The hygrometer is off, way off. They say it will be within +-5 % of indoor humidity (which is common) but this is not even close. Using a Boveda calibration packet (sets an airtight container to a perfect humidity within .5 of what the bag says it will) and also placing another calibrated hygrometer in the same container I left it over night. After 24 hours I checked, my calibrated hygrometer read 74% (one off), this one read a shocking 60.8, so over 14% off. The next 24 hours my calibrated hygrometer would move between 74/75, this one ranged from 61 and at one point momentarily reached 63. This is considerably greater than what the box says.

It gets worse. Because it fluctuates even at a constant humidity, you can not just subtract a certain amount to get the correct amount (for example, if it read 70 for what should be 75, I could always subtract 5 and have an accurate reading). There is also no calibration option on this device.

Overall: It gets two stars because it will tell you the temperature. For the price, however, you can find a cheaper thermometer. It WILL NOT accurately assess humidity in a controlled setting, so if you need it for a humidor (like me) or something that also requires accurate readings (musical equipment, I hear hatching eggs is also like this?) you are better off spending another $5 to get something you can at least calibrate. If you're just monitoring a room in your house for fun it may be worth it, as you don't have much to lose.