I have discovered Onboard Diagnostic (ODBII) scanners as a new device class. It is tool for those who interested in some insight on usually hidden car parameters. Modern car have standard controller area network (CAN) and standard diagnostic interface (OBD), that allow to collect and analyze some car internal data with universal devices.
My set up was devices: Apple iPad Air + Parkcity ELM-327WF (~80$) and application DashCommand (10$). ELM-327WF using Wi-Fi to connect tablet or smartphone. There is also cheaper Bluetooth version OF ELM-327 exist, but it not work with Apple devices (due to Bluetooth limitation in iOS).
See application screenshots below:
Connector for the device in my car looks like:
