Product review (5 stars): Dead-on accuracy, inexpensive cost, free shipping from China - you can't go wrong.
Bought three of these due to inexpensive price and the free shipping. Note - allow 3-4 weeks for (FREE) shipping direct from China. All three were dead-on accurate against each other, and against other known (good) thermometers and humidity meters. Temperature accuracy is within 1/2 degree F and humidity within about 4%.  It took a bit to figure out how to switch it from C to F because the Chinese-English instructions "In the bracket C and F conversion key". The button (not a key) is under the swing out feet so that the unit can be placed on a flat surface. Use two fingers to pull out the bracket so you don't snap one of the legs off.