The Engineering Life - Around the Web
A multimeter modification for reading ambient temperature
Displaying the temperature inside a refrigerator
It is no secret that analog temperature sensors output voltage that is linearly proportional to voltage. That is exactly what they are made to do! However, it probably didn't occur to many people that you could just toss one into your multimeter to have a quick ambient temperature sensor built in.
The additional circuit in place
In this tutorial, you can read about how to utilize the 3V com voltage and a TMP35 analog temperature sensor to add this feature on your own. It is really quite simple now that the research has been done, and only requires the temp sensor and two resistors. Of course, using this sensor will only allow you to measure from 10°C to 125°C, so if you need a broader range you'll need to do some research on your own.