...change the fluid? my local mechinac cannot locate this tool any place does that only infinity can change the fluid?

Try a Nissan dealership. That's where I go/call for problems with my Infiniti.

true, you have to have a scan tool to know the temp of the trans fluid and level varies according to temp. And you must have the factory designed dipstick, which is actually a special tool. Snap-on may carry a universal one?? Why do u need to change the trans fluid anyway?

The reason your car did not come with a dipstick is because you do not have to service the fluid and Infiniti is protecting you from having the wrong fluid added.