http://accessories.musiciansfriend.com/product/Planet-Waves-SOS-Strobe-Pick-Tuner?sku=210066 (http://accessories.musiciansfriend.com/product/Planet-Waves-SOS-Strobe-Pick-Tuner?sku=210066)
The link is to a small pick-sized guitar tuner that shines a strobed LED on the guitar string. You set what note you're tuning, then tune the string until the beams appear static.
This looks promising. The third string (D) on a guitar is 147hz. The Ducati service manual specifies 140hz (+/- 5hz) for both the horizontal and vertical belts for my '06 s2r1k.
I ordered one just now. Will let you know if it was worth the 15 bucks. (I posted this on TOB by accident. :-[ Didn't mean to.)
Here's the right link: http://accessories.musiciansfriend.com/product/Planet-Waves-SOS-Strobe-Pick-Tuner?sku=210066 (http://accessories.musiciansfriend.com/product/Planet-Waves-SOS-Strobe-Pick-Tuner?sku=210066)
[popcorn]
Might want to consider this (http://ducatimonsterforum.org/index.php?topic=17039.msg300058#msg300058) before you use that tool for your belts.