For 1.5v and 9v batteries, read off upper scale. For 1.5v miniature cells, read off 'button battery' scale. Portable handheld designPerfect ... in only one unitUsed To Test The Following Sizes:1.5V: AAA, HP16, MN2400, R03AA, HP7, MN1500, UM3C, HP11, MN1400, SP11 ...