Originally Posted by Hans
or you could get one of thsoe..thats what I use.
Yeah, but I want to track the temp over time. To do that with an infrared thermometer I'd have to live under the hood. There'* not enough room for me, the thermometer, a clipboard, and
my Scooby Doo lunch box. I also want to get actual coolant temperature. For no particular reason, other than just to see what the data looks like.
Originally Posted by popatim
Isn't a thermocouple the thing that tells your furnace the flame is lit?
How do you get one to tell you the tempurature?
Yes. But a thermocouple is nothing more than a couple wires of different (particular) material soldered together at one end. When the temperature changes it creates a difference in potential which can be measured. In a nutshell.
Certain metals give a very predictable electrical output when heated. Instruments, like a datalogger, can measure that and correlate it to a temperature. Some digital multimeters can do it too.