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If budget is not an issue, there are 3D scanners with ‎0.1 mm of resolution.


Photogrametry usually works quite well unless your object has some very complicated internal cavities. The good thing about photogrametey is that you can easily collect the data with any decent smartphone. Just remember that cameras lose scale so be sure to survey atleast one dimensions with a measuring tool. Or instrument the scan with a known object. There ...


May sound not very precise but i take a stab on it. Wrap your object with wet thin paper, engineering tracing paper for example(Bienfang paper), let it dry with a hair dryer, then cut it into flat squares and triangles. Measure and add the surface area of the pieces. Alternately you can project a narrow beam of light so that it cast shadows of many angles ...


modeling soil behavior in a scaled-down lab system requires that the force of gravity be scaled up to maintain dynamic similitude. This requires the scaled system to be spun in a centrifuge at a speed which is mathematically derived from the linear scale-down factor. As pointed out by ShadowMan, there is an extensive literature on scaled modeling of soil ...

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