The classic and well known carbalancing kit by Gunson. This genuine Gunson item has been used for years for carburettor tuning and balancing. Measures and indicates airflow so that each carburettor butterfly can be synchronised to give the same and balanced air flow. Suitable for twin or multiple carburettors. Suitable for use on most carburettors (side draught and down draught with air intakes (venturi)). Suitable for air intakes from 1" to 21/4" (25mm to 57mm) diameter. Suitable for use on SU, Solex, Autolite (Fomoco), Stromberg, Weber and Zenth carbs. Improves performance, produces more miles to the gallon and better acceleration. Very simple to use. The scale is clipped vertically to a suitable and convenient part of the vehicle (Clip on universal ball joint provided). The tool is held against each air intake to give an air flow reading for each intake. The carburettors can then be adjusted to balance the air flow. A very simple and reliable tool that takes the guess work out of balancing multiple carburettors. Price includes VAT and an invoice is included.