Managed to get my hands on a Microscan III today. Didn't get to try a whole lot with it but my first impression is good. It DOES have the ability to graph data. Refresh rate is so-so, but if you make a custom data list to graph, (4 parameters vs. all available parameters) it speeds up drastically. Packaging says it will support Asian and European cars, although to what degree I'm unsure. Also supports OBD1 with the proper adapters. Hope this gives you a bit of insight. If you have any questions I'll do my best to answer them for you.