Not Ranked
Haven`t used the one you show , but I used one that was very similar to it on my Porsche`s Zenith carbs . That was the only way to check float levels with the engine running .... which is the best way to find out what is going on .
Mine was easy to use and pretty much indispensable if you had Zeniths . Did some digging and I still have it .... complete with the correct graduations for the Zeniths . Got it direct from Porsche of America many years ago.
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