you can buy lots of obd scanners. When I had my Volvo and DSM, I used an old m105 palm pilot and obdgauge.com's software.
Now, I use the Android app "torque" and a bluetooth adapter. I'm able to look at all the car's stuff on my phone. You could use a tablet, too. and I'm pretty sure there's an Ios version, too.
This is the OBDII adapter I purchased. People have said it's a knock-off and whatnot, but mine works perfectly.
...something about 1.5 not being a real version or something. Either way, mine always connects, and always shows everything I need it to.