Sorry, I don't understand the function- graphing capability clearly. Could you please explain more? Do you mean the live data?

  There is no option to select a particular voltage range to view a pid selection in and keep it in that range selection to be able to watch a consistent change of graphed voltage from minimum to maximum in one scale you wish  it could be in . It constantly auto ranges, going   from 0 to 2 volts , then graphing abruptly changes to higher voltage  ranges.

  Sorry to say graphing SUX on almost all Pro level tools regardless of cost or manufacturer.

Believe it or not, a $10 or less App and a $20 or less interface will run circles around most of the Pro level tools.

Get OBDFusion for your smart phone or tablet and the proper interface.

These tools can Log ALL generic/standard OBDII PID's. You can pick and choose what PID's you do or do not want or need. The Log file is formatted in a .CSV file format. You can then use MS Excel or OpenOffice to graph the results. Yes, it is not a single one step way to gather and Log/Graph data, but I have been doing this for a long time and this is the most flexible and best way to graph info. Once you get the process down, it is not too difficult.

Here are a few examples:

https://www.dropbox.com/s/85zdos2fcoa4gwr/Fuel%20Trim%20%26%20RPM%20Graph.jpg?dl=0

https://www.dropbox.com/home/O2%20Sensor%20Graphs

https://www.dropbox.com/s/4n3tdhdred1z4r3/MAF%2C%20LTFT%2C%20RPM.jpg?dl=0

https://www.dropbox.com/s/mpuj11fw44rfhy4/Speed%20%26%20Temp%209152014.jpg?dl=0

 Still think the OBDII Apps will blow any of the commercial tools away. It is a function of polling speed and crazy auto ranging some of the tools use. Although the JP701 may look better than the DS708, I would bet the OBDII App is even better than the JP701, albeit it takes a few more steps to download the .CSV data and import it into a program like MS Excel and graph data.

I find between the polling/update speed of tools in real time, the display resolution of the tools, auto ranging and the small buffer size that usually only allows the screen width of data to be viewed ALL standalone tools come up way short in my book.

I think you might be surprised what a $10 or less App with even a cheap $20 or less wireless interface can do. I have been using these for a long time and will not even consider trying to graphs much on even Pro level scan tools.