On the Iphone you can use Omnituner or another tuner that lets you view the frequency,
or you can tune to the piano equiv. of A2.

Here's a reference tone - http://www.youtube.com/watch?v=YHJtpHftzkI

Next check the freq. of the exaust. Paso - the other musical instrument

The "factory tool " is nothing more than a spring balance scale ( sorta like you'd weigh a fish on ) with 2 marks on it that line up when the correct tension is reached . The idea is to hook said spring balance ( or preferably any other with kg's marked on it ) to the post in the center of the tensioner pulley and pull till you have a reading of 10 kg and do up the tensioner bolt , a lot of fuckpotting around .... I just use the allen key method.
Another thing I did was to hook up a timing light ( any cyl will do as timing has nothing to do with this ) and aim it at the slack side of the belt ( tensioner pulley ) and give the engine a good rev and you can see if the slack side of the belt is starting to flap about . This proves nothing other than I was bored and don't nobody use this to tension their belts , more of an observation than anything

5/6 mm. allen key! The easiest way to tune the belts.
No esoteric method.
Ciao

I followed the instructions using the 5mm and 6mm hex wrenches to verify belt tension and it worked perfect. I have the retainer rims on my belt sprockets and removal/installation was easy once the tensioners were fully loosedned. I removed the spark plugs and put the engine in 4th gear and rotated the rear wheel to align the sprockets before I took the belts off. All in all a very simple job to do. Thanks all!!