While the Kiosk Mode can be used for both mobile and stationary applications, the most common use case is for attendee self-scanning with the device in a fixed position. The attendee simply holds their QR code credential (or barcode) to a frame within the front camera view.
The iPad has been a very popular device because the front camera scans well even without autofocus. However, there are also Android options to consider. We tested the Amazon Fire 7 tablet (9th generation) with surprising results for a $65 USD device. We found the front camera was able to quickly scan QR codes.
It was stable over a 5-day test period, even with the camera open for scanning the entire time. When the device auto-refreshed with our server, the camera was closed but restarting scanning was as simple as tapping the screen.
We simultaneously tested a convertible Lenovo Duet Chromebook with similar results. Scanning was fast and the device stable. The price we paid was $250 USD so it’s affordable. There are Chromebooks that will out-perform the Duet but they cost more.
To keep the Fire 7 from going to sleep we used a free, third-party app from the Amazon store that worked well. The Duet included that as an option in the device settings. We did not test Android Screen Pinning but there are several apps for that.
For mounting either device, there are many options. The hardware shown in the photo below can optionally be mounted to a surface with screws and it has a locking key for the Fire 7 itself.