Martel Electronics BetaGauge 321A-Ex - Manual (Page 29)

13. Maintenance
13.1 Replacing Batteries
Replace batteries as soon as the battery indicator turns on to avoid false measurements.
If the batteries discharge too deeply the 311A-Ex/321A-Ex will automatically shut down to
avoid battery leakage.
Note: Use only AA size alkaline batteries.
Warning
Only change batteries in an area known to be non-hazardous.
Approved Batteries
Battery Manufacturer
(All Batteries Alkaline - A 1.5 V) Type
Duracell MN1500
Rayovac Max Plus 815
Eveready (Energizer) E91
Panasonic LR6XWA
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