Prokit's Industries MT-4017 - Manual (Page 12)

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Use the following procedure:
When the battery voltage drop below proper operation
range the symbol will appear on the LCD display
and the battery need to be replaced.
 Press the battery cover and towards arrowhead
direction to open the battery cover.
 Replace the battery with three new 1.5V batteries
(AAA).
 Replace the battery cover.
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