Product review (5 stars): Economical hygrometer works as intended!
The TP50 arrived quickly -- in time to take a few helpful room temp/humidity measurements for days before a humidifier arrived.  When ordering the TP50, I was a little concerned about its accuracy but its temp readings have been in line with our thermostat and another room thermometer and I'm satisfied that the humidity readings are close if not absolutely precise(and it may be for all I know!).  The trending data it has provided has been very helpful in confirming the correct function of the new humidifier!