Videomaker – Learn video production and editing, camera reviews › Forums › Cameras and Camcorders › DSLR’s › Exposure While Filming Device Screens? › Easiest way is to go manual
Easiest way is to go manual and use your camera’s iris. If the product and its screen isn’t moving you also could composite the screen image into the shot in post. I’ve done this quite successfully with an image on a video monitor.