An Airflow Meter allows you to quickly tune your engines carburetion. These precision instruments are designed to measure the airflow directly on the air intake of the carburettor and can be used at low and high RPM on down draft and side draft engines. The sensitivity and accuracy of the Airflow Meter is much greater than any other type of synchro tool or gauge. The range of indication is very broad on the lower end of the scale to ensure precise adjustment at idle RPM. While a single instrument is sufficient, the use of one per carburettor is advantageous. The airflow of each carburettor can be constantly observed until the tune-up is completed. Made in Germany, the BK Model is supplied with an adapter that is ideal for all ram pipes and intake bores of 11/4" to 21/4" (32 to 55mm Diameter) and provides an easy-to-read indication from 1 to 30 kg/h.