Now, you have one more reason to go to your local hobby store:
Novak is shipping Sentry Data Loggers!
The two versions of the Data Logger — the Sentry Data Logger (#2000) and the Sentry Data Logger-Pro (#2010) — both include multiple sensors that record data from multiple parts of your R/C car. The Sentry Pro includes four extra Digital Sensors and Expander Board, and Current Sensor.
Simply plug it in, and the Data Logger will measure and record information from several tiny sensors placed all over your R/C car!
Source : Novak