I'm not suggesting it for daily basis.
It shows you your actual mixture in real time. Quite handy when jetting Webers that were not OEM. Real time readings.
Is that transitional bog due to a rich or lean condition?
Are the mains so lean you risk burning a piston?
Do you wanna spend a little over $100 for the tool or guess with hundreds of dollars worth of jets, tubes etc?
78 Spider, Webers, header, Shankle cams, bumperless, lowered, Konis
78 Sport Sedan, header, Spica