THIS REDLINE AIR FLOW METER IS USED TO ACCURATELY BALANCE THE AIR FLOW ON CARBURETORS,  SYNCHROMETERS, FOR THE CONSCIENTIOUS TUNE UP SPECIALISTS. IT PROVIDES PRECISE INFORMATION ON ALL MULTIPLE CARBURETOR SYSTEMS AT IDLE AND MID RANGE TRANSITION MODES AS WELL AS QUICKLY SPOTS WE ALSO HAVE ADAPTERS AVAILABLE FOR OTHER CARBS, DCNF,DGV, DFEV MANUFACTURED IN GERMANY