hello @Nicolas, welcome to the Tulip Community. it would be great if you could introduce yourself at: Welcome to the Community, let's meet!!
regarding your question, USB devices (aside from Barcode Scanners) are indeed connected to Tulip via a Gateway. do you have more information on the make/model of the calipers?? you can see the devices we integrate with out of the box here: Measurements - Length | Frontline Operations Platform.