Carbtune Pro motorcycle carburetor synchronizer will easily and accurately sync the carburators and throttles on motorbikes, 4-stroke outboards and snowmobiles. Superior resolution to dial type gauges Easily read scale Comes complete with 4 x 5mm and 4 x 6mm Brass adapters and rubber hoses to fit virtually any bike Stainless steel columns indicate vacuum No calibration or set-up required High impact plastic casing and scale tubes - no glass Dampers supplied to reduce fluctuations Clips onto handlebars for hands free operation Full instructions Stores in your tool pouch