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Some of the company's that sell them say 'let it set for 5 minutes'...I'm finding that it can take an hour or more for the mixture to settle to it's final resting place. The testers are accurate when properly used, but I've got a feeling that some people are not letting them set nearly long enough. I'm using the Zeitronix in-car unit now, but I'll still use the tube for various reasons.
 

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Mine usually takes about 30 minutes to fully 'settle', but I've let it sit overnight with the cover on, and it stil gives the same value.
 

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The one I have is made my Quick Fuel Technology.
thats the one that i used last night and checked mine right on 85% and it separated very quickly but in the instructions it says leave sit for like 5 mins. after a good majority has settled you get the idea of where its at. i havent seen one change but sitting it over night. A digital gauge like the zetronics would be nice though.
 
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