Mastech MAS830L - Battery, Fuse, and Attachments; Battery Replacement Guide; Post-Maintenance Security; Electrical Shock Hazard Warning

The replacement should be of the same specification.
3. The battery for this multimeter is 9V NEDA 1604 or 6F22.
The replacement should be of the same specification.
4. Don’t put the instrument into use until the rear cover is
screwed after replacing battery or fuse.
Attachments
 Instruction manual: one copy
 Probe: one pair
 Package: one piece
 9 V battery NEDA 1604 6F22: one provided (in the
multimeter)
 K thermocouple sensor: one piece (MAS838 only)
 Rubber case (optional)
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WARNING
To avoid electric shock, make sure the probe are disconnected
from the measured circuit before removing the rear cover. Make
sure the rear cover is tightly screwed before using the instrument.