I have not read of anyone who has the tool.
bp2930,
By now you have searched and read many threads and are still confused.
You can get the belt tensioned at a shop, and then return in 1000 to 1500 miles for a retension. $$$
You can find the "official" tension tool P9201 and spend $$$$
You can get a great set of tension tools at Bruce Arnns
Home that are easy to use and the best for a new owner. Not cheap but will pay for themselves in the first use rather than going to a shop. $$
I do not recommend the Krikut tension tool. Not accurate enough for the cam belt. OK for the balance belt.
If you read Clarks on the tension methods, a lot of people use the 90 degree twist method. This is OK for experienced mechanics who have the "feel". I do not use this method.
Your best tool is the Arnnworx tool for a new owner with hesitation and fear of cam belt breakage leading to bent valves on the interference engine.
GL
John