My Lunasix 3's has the last set of Mercury PX625 batteries installed, and I just wanted to know who is using their gossen meter with their newer battery adaptor? I will eventually need to use one of these, or go with the Zinc Air batteries. I hear mixed feelings with zinc air batteries as they do not last long. So the battery adaptor is looking like the only option. What I would like to know is, is it working well for you? Also, does the adaptor have the little diode and resistor that lowers the voltage down to 2.7 volts? I am curious how these adaptors are faring using the LR44 silver oxides, and how accurate the meters are using them? I was also thinking that the CN1/3 lithium might be a good fit for this application, but am not sure?? Anyone try it?