I ordered a cheapass K-type thermocouple with digital readout - a TM-902C from Ebay - and it arrived today. The problem is that it reads cold objects as hot and vice versa. I've taken it apart, and there's no way anything could be reversed on the board, so my guess is that the two wires are reversed inside the thermocouple connector. Does that make sense? If I put my digital voltmeter on the connector, with the red lead on the plus pin, and turn on my hair drier, I should get a positive voltage, right? And if it's negative, which it is, that means the wires are reversed?
Will I be able to reverse the wires using regular solder, or do they have to be welded or something?
Of course I can send it back, but if it's a simple fix, I'd rather avoid the delay in getting something that works.