Via a small and compact data collector. The reporting and analysis of the information happens afterwards.
Through a tablet. In addition to the name and other contact details, you can request and process more information. You can forward the information in real time, so that the back office can react during the course of the event.
Handheld devices: these compact devices are convenient to use. They can also be used outdoors.
Via a kiosk with a big screen: there are many possibilities. You can let people vote for the most innovative product at the fair, pre-register for a roadshow, show interest in a product or service, ...