It’s a problem that few of us will ever face, but if you ever have to calibrate your scanning electron microscope, you’ll need a resolution target with a high contrast under an electron beam.

The iMicro Q3p is a fingertip microscope for your smartphone, but its claimed 1200x range fell short in my experience.

The top and bottom cameras measure OD, ID, roundness, and concentricity. Parts can be measured to print specifications through Gi’s software, and each dimension is saved and recalled by part number ...

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