Marble Gauge 13.5mm-14.1mm
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Gauge for measuring the circumferences of various common marbles. 13.6mm to 14.2mm. Good for marble run designs.
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If the marble passes through with low resistance the marble is +/- .05 mm of that gauge. Low resistance meaning, does not pass through freely, and does not take exertion to push through. About the same amount of force used to click a pen.
Note: It might seem logical randomize seams, but I found the randomizing the seams meant you were removing material form multiple spots and that could mess with the measurements. If the seams are in one line, then only that one area of the diameter is affected.
Why? Needed a gauge for a marble run design for my kid's project. This tool is much quicker than using a dial gauge for a box of marbles. Also good for using the same size marbles for cheap homemade ball bearings.