Product review (1 stars): this instrument is useless and a waste of money
The temperature function is marginally accurate, the humidity sensor is wildly inaccurate.  When tested in known humidity environments it was wrong (read high) by 20-28% in every test.  with no provision for calibration, this instrument is useless and a waste of money.  Also, the manual is laughable and was obviously written by a non-English speaking layman without technical experience.  Save your money!