As far as I know the remarks about it being a standard 9v alkali battery are right. I have a Fluke 87 which certainly has. I had a problem recently, my battery was still working OK but I saw it was in for two years, I make a note on the back of the meter. I opened the case and the battery terminal was corroded onto the battery. The terminal fitting is a low grade affair compared with what else is in the case. You may find you have to buy another terminal fitting and graft it on to the old wires.