Scythe Kama-Thermo
 

The Scythe Kama-Thermo is a very simple, blue backlit temperature LCD display with a connected diode. The cheap price tag makes it very appealing to most case modders. It is quite small, but has large enough digits and a very good contrast so that the temperatures can be read from further away. The Kama-Thermo combines simplicity and functionality to form a great little device.

http://www.techpowerup.com/reviews/Scythe/KamaThermo