HEM Data has a family of DAWN Mini LoggersTM for light duty and heavty duty vehicles that fit within the palm of your hand. They connect directly to the OBD or J1939 conenctor. Options that are contained within the logger are GPS, WiFi and cellular.
The loggers are excellent to captrue intermittent faults.
Data can also be seen on smart phones and pads.
See details at http://www.hemdata.com.