Pentax ETH-310 - Manual (Page 13)

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1.4 Preparation of Power
• Remove battery box from the unit by pushing the release button on
the top of the battery box. Remove the battery box cover.
• Insert four AA batteries into the battery box according to (+) and (-).
• Press the battery box to the leg by inserting the guide pin
to the guide groove.
• Confirm the correct work by pressing the power switch.
This instrument can operate using 1.2V AA rechargeable batteries.
• The four (4) batteries, in a battery box, should be of the same type.
Do not use batteries, in a battery box, which have different remaining
capacities.
• When a battery box or batteries are wet, wipe off the moisture
immediately and dry completely.
• When a battery box is removed from the unit, power must be off.
If the battery box is removed with power on, it will cause trouble.