If you are using PigVision Mobile Sows to register in the stable, you can add a QR-code to the printed sow card and use your phone or tablet to scan the QR-code to find the sow.
See how to add the QR-code to the printed sow card here: https://help.pigvision.com/en/support/solutions/articles/60000708531-add-qr-code-to-sow-card
Scan the QR-code on the sow card by tapping the symbol next to the search field.
This will turn on the camera and you can now scan the QR-code on the sow card.