Companies like HP, Viewsonic, Samsung and LG make screens with these built-in sensors.
Hi Ashley. Thank you for your input.
This one is a 22-inch NEC MultiSync without a build-in sensor; I would like to add one by plugging it into one of its USB-ports.
Remains the question if such an external USB-device with a rotation sensor is available on the market. I have been looking around, but I haven't found one yet...