Product review (4 stars): Circuit board changed from earlier reviews
They appear to be changing the circuit board constantly on the product that they ship, as the one I got was different than all of the other postings with pictures and instructions on how to modify the thermometer to display Fahrenheit. The circuit board in this one only has two adjacent solder pads very close to the black patch (integrated circuit).  There is no marking beside the pads.  I figured that if there was going to be a way to change readout units, this would be it.  I soldered across the two pads and it worked.
For me the only downside is the short ( 30") cable on the thermal sensor.  What do you want for $2.