Connect 2 scanners in parallel to one PC

Problem description:

You have connected 2 scanners (blue F-scanner & white F2 scanner; blue F-scanner & 3D full-foot scanner or white F2 scanner & 3D full-foot scanner) to a PC. Now you want to scan with one scanner, but address the other scanner.

Problem solution:

Do not run 2 scanners on one PC at the same time. Either disconnect the power connection via the power button on the scanner or via the power supply unit in the socket. Or disconnect the USB connection to the PC. A USB hub can help with the latter.
Now please only switch on the scanner that you want to use for scanning.