Brymen BM161s User Manual page 10

9
Battery replacement
The meter uses standard 1.5V AAA Size (NEDA 24G or IEC R03) battery X 2; or 1.5V
AAA Size (NEDA 24A or IEC LR03) alkaline battery X 2.
Loosen the 2 captive screws from the battery cover case. Lift the battery cover case.
Replace the batteries. Replace battery cover case. Re-fasten the screws.