Nikon DTM-502 Series Instruction Manual page 15

CAUTION
Roughly moving the instrument by grasping the carrying handle battery
without first placing the battery mounting buttons in the LOCK position
2
may cause the main unit to come loose and fall, resulting in injury or
instrument damage. Make sure that the battery pack is clamped
securely in place and the mounting buttons are set in the LOCK
position.
• An external battery (optional accessory) is available for use with the
NOTE
DTM-502 series. When the external battery is connected and the
battery pack BC-80 is mounted on the DTM502, the DTM-502's
electrical source will automatically be switched to the one with the
higher battery power.
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