Product review (5 stars): Absolutely fantastic for the price!!
It took only a few minutes to convert to Fahrenheit (thanks to those that have posted on how to do this).  I plan to use this to monitor temperatures in the process of homebrewing beer.  As such, accuracy was a concern.  In a saturated ice bath, it was dead on 32F.  Unfortunately, the programming inside of this unit does not allow the display of any numbers above 199.9 (above this value, it will only display "Hi" [sic]).  I assume this was a logical limit given the intended Celsius display.  However, when converted to F this prevents you from checking the accuracy at boiling.  To overcome this limitation, I used another thermometer that I know to be accurate at frezing and boiling to within 1 degree to check this at temps slightly below boiling and this piece looks to be good within the same +/- 1 F.  For $2, I couldn't be happier!  I have 6 more of these on order (at this price, why not have extras for what ever uses I may find), hoping to see the same performance.