which scan tool do you use, and recommendations

[Pis-ton broke]

thanks Franco, i check out all of those links and they are too expensive for me. i,m problembly looking to pay $500 tops. (if doable)

i guess i need compatibility with ford, holden, toyota, the main brands here in australia. obd1 and 2. code reading , light clearing, easy to use, updatable would be a real bonus.

i repair a few cars now and then, so i,m not a pro.

my latest efforts is a 3l diesel pj ranger, full engine rebuild, well i started it first time last night and took it for a spin up a dirt road, it goes quite well. however the engine light is on and its got an engine shake just up off idle,then goes away, so its got some bugs to sort.

thanks