It has a batterycompartment on the back. I think it measures a little bigger than my cameras spotmetering, and that´s good. I want to measure the light in the room and not just one spot. Do you think I can put a white bulb-like thing on top off the "hole" ontop of the meter so it measures less "spot"-like, if you know what I mean? More like a modern lightmeter...

///Anders S