New limited time deal on Davis Instruments 8226B CarChip Pro (New Model). List price of 119$, previous discount of 89$, but current sale has the Davis CarChip at 75$! Only lasts a short while though. Very handy device for monitoring your engine, and easy to use even for people who aren’t auto savvy. Plug the CarChip Pro into the OBD-II port and you are ready to log the data. Take the chip out and connect to the computer through USB. This chip logs data in 5 second intervals as you can analyze check engine light, use an audible alarm, and check many other parameters.