BLR154 Alkaline BATTERY FOR AVO Model METER 15V 504 Multimeter 15 volt
Later models use the BLR154 type, both are 15volt and rated at 40mAh. BLR154 Height: 34mm. Diam: 15mm. ALKALINE BATTERY. Battery colour and style may vary. BLR121 Height: 36mm. Width: 15mm. Length: 26 mm.