Hi @NewtoRhino, as Sky, i would advice not to use the _Sketch command and use single _Point method instead. If you can see your mouse pointer moving on screen while you move the digitizing device, make sure to move your mouse to one of the viewport corners so it does not influence the digitizing process.
Also turn off all object snaps which can cause strange behaviour. I’ve used a MicroScribe and a MicroScan laser scanner attached to the digitizing arm during the last decade. Of course, laser scanning is way more efficient since you can work touchless and get +10K points per second.
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c.