It would work fine. (If I had a digital back.)
It also works with a DSLR, but it's a little more trouble. If the laser centers on the lens cap, and at the same time, the location of the laser device (on the painting) centers in the viewfinder when viewing the painting, then the sensor is aligned with the artwork.
But, I'm careful to make sure I haven't forgotten to place the lens cap on the camera.
A friend and I did some copy work for a while, and in the beginning, we used gravity (and a level) to align the sensor vertically, and used dimensions to either side of the artwork to align horizontally. This meant that we had to keep the artwork vertical, implying that we had to, in some way, pin or use a sticky clay to attach the artwork to a wall. To me, that was unacceptable.
This device allowed us to simply rest the artwork on a non-vertical easel.
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