AFAIK there are four affordable (Under $100) carb sync tools on the market for four cylinder motorcycles.
The Morgan Carbtue which uses stainless steel rods do indicate vacuum levels about £55 (aprox US$82) or £62 (aprox US$92) with a tool pouch (Mechanical)
http://www.carbtune.co.uk/Images/SSL11411SC.jpg
Emgo Gauge Set which uses four vacuum gauges to indicate vacuum levels about $70 (Mechanical)
http://www.denniskirk.com/denniskirk/b2c/product_images/3/8/0/600pix/38040005.jpg
Motion Pro SyncPRO which uses "New mercury-free design uses non toxic manometer fluid" (Liquid) about $100.00
http://www.motionpro.com/images/enlarged/08-0411.jpg
And my personal choice the mercury manometer (AKA mercury Carb Sick) that costs about $55 and will NEVER go out of adjustment, however the mercury is not a nice substance to have around your home... and to transport it you need to drain it. (Liquid)
http://www.saber-cycle.com/store/media/parts/08-010.jpg
CLICK HERE TO BUY ONE if they still exist
Does anybody know of any other affordable (under $100) for the home mechanic Carburetor Synchronizer tools that are on the market???????