Product review (5 stars): Small price Big results
Had these a week so can't speak to longevity however they work 100%.  They are accurate as I have 2 that I'm using in my chameleon cage and I've check the temperature with a IR temperature gun.  These are great little thermometers.  The humidity is also consistent with 2 that are in the same enviroment.

Don't let the low price or the other low reviews fool you.

I will say that if the sensor fills with water they will read 99% humidity until it dries out so maybe that's what others have experienced.