I have a Luna Pro F. The battery check works, and the meter appears to work except the needle always pegs all the way to the right. When I press the button, the needle shoots all the way to the right, regardless of the light level. I rotate the dial all the way through its range but the needle stays max'd out. After 30s, the meter turns off like its supposed to. It almost seems like the computer dial is completely disconnected or something. Any ideas what can cause this?