Hi Lloyd, Your Precision 120 takes two 1 1/2 volt cells and a 15 volt battery. I'll email the specifications and schematic. It doesn't list the battery number but now you know it's 15 volts you can search for one that's available and fits the space. Don Black.
: I have one of these that
: looks to be in operating condition.
: It takes 2 D cells and a smaller
: battery. Anyone have any idea on the
: battery size/voltage?
: Pleas reply to my email