Product review (5 stars): I like its roughly 2
I purchased the ThermoPro TP50 Digital Hygrometer to determine what the humidity in my bedroom was.  I like its roughly 2.5 inches x 3 inches size as it sets on my dresser and doesn't take up much room.  It started working upon inserting the accompanying battery.  I have had no problems with
it.  The hygrometer arrived on time in good condition.  I have owned it for about 4 months now.  To me, the humidity readings seem to be in the ballpark.  I cannot attest to degree of accuracy as I've nothing else to measure humidity.  The thermometer seems to be correct as the bedroom's temperature is always one degree below my thermostat's reading.  That makes sense as the bedroom is at the opposite end of the house from the furnace.  All to say, I am happy with the purchase.