n an effort to resume previous work [A, B, C, D] on developing a crystal oven for radio frequency transmitter / receiver stabilization purposes, the first step for me was to create a device to accurately measure and log temperature. I did this with common, cheap components, and the output is saved to the computer over 1,000 readings a second. Briefly, I use a LM335 precision temperature sensor $0.70 on mouser which outputs voltage with respect to temperature. It acts like a Zener diode where the breakdown voltage relates to temperature. 2.95V is 295K Kelvin, which is 22ºC / 71ºF.