It's a simple little tool based that works like a ScanGauge for those among us who can't use a ScanGauge. It's also cheaper, in that it comes as a preassembly, or a DIY kit.
The only foolish question is the one that goes unasked. The only way you can truly be foolish is to think yourself a fool for the desire to learn.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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