The old faithful is not very accurate . . . in the old days when i worked in music stores, we used to check the batteries that came with BOSS pedals that way. And man, they would part your hair! Finally we took a couple into the shop and the tech put 'em on a meter: 10.5, 11 volts consistently. Called Roland in LA: We get them REAL warm, as who knows how long they'll be on the shelf, and want our customers to have their first battery on us I appreciated their thoughtfulness . . . after my tongue quit smoking!
J o e y