The Porsche Tester is over 10,000 dollars U.S. So do you really want it? IF you just want to read codes there are many OB2 code reader out there from 200 up. You get what you pay for. The advantage of the Porsche unit is that you can make changes to the computer and turn off the dreaded check engine light
Check around with the independent shops in your area. Several of the Porsche independents around here have PST2's and are willing to do things that you often wouldn't ask a dealer to do. Cost - $75-90/hour for labor.