Aaron...
I have the Auto X-Ray model#
It does take value readings, at what rate I do not know...Brian is much more informed than I...But for example I can get my MAF & TPS voltage...It take real time data, and memory data, and performs the KOER and KOEO tests, it gives you the code and then you scroll through the pages it brings up for troubleshooting explanations, then on to the next code and so on...You can bring up your data and save it for referance...It has been a flawless tool, although I did have a problem with it once, called the company and they had me up and running again in five minutes, I was very impressed with the service they were able to give me over the phone...
I would say that if you need a good scan handheld this is a good one for the money...What I got is all I need for what I am doing at this point anyway...
Brian...Thanks for the input on your unit...
Brad