The unit is nice and worked well until I took the battery out. After removing and reinstalling the battery the unit no longer stays on Fahrenheit. Now the only way I can get it to display on Fahrenheit is by keeping the F/C button depressed. I contacted their customer service dept. to address this issue and have never heard back from them and this was 3 weeks ago. Furthermore the auto shut off feature is useless because it only turns it self off if there are no fluctuations in the temp for ten minutes, which is impossible because the temp is always fluctuating so make sure that you actually turn the unit off or it will stay on.