cheap OB2 scanners??

I picked one up off ebay for about $17 delivered a couple weeks ago. My daily driver trips a coolant code once in awhile. I can now clear it myself. Works great. No batteries. Just plug in, read code & clear.

http://www.ebay.com/itm/400522732526?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649


Another option is a ODBII to android/iphone adapter. Then there is a $5.00 app that does more than the $17 scanner.

I know these aren't $2500 professional scanners.....