DIY Digital Caliper Micrometer Comparator

Step 3Testing Your Scanner

Testing Your Scanner
Every scanner is different, so it's important to do some basic checks to see how yours works.
One simple check  finds the center of the scanner sensor array.
Usually this is a path about an inch or more wide running down the center line of the glass.
Use paper tubes as shown, or LEGO bricks.
Place them on the glass with the scanner lid up.
Run a preview scan.
Now see the next step.

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