I just acquired a Gossen LunaPro F from keh (EX rating, if I remember correctly). I used a standard Duracell 9V battery. when I perform the battery check, the needle moves to what I think is the furthest position on the right. This is past the green "BATT" field where it is supposed to rest in per the manual. When I take a reflected reading, the needle moves to a position , say 'under,2' and holds. So far so good, but when I try and move the dial to move the needle to "null" position, the needle refuses to move. The needle corresponds to the green zero mark on the left of the scale so I have not tampered with the zero adjustment screw. Alkaline batteries may have higher or lower voltages than the rated 9 V depending on age and this might be causing the out of scale battery check reading. But if I understand the manual correctly, the needle is supposed to move with the dial. Is it a dud? Am I doing something wrong?