GPI GPR-G9, Instruction Manual

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Lay the instrument on the flat surface, and keep the slope of instrument
within the range from -5° to +5°.
2.3 Operations
2.3.1 Power
(1) Press the key ON/OFF to bring automatic leveling into function when the
power indicator lights.
(2) When power indicator blink, it shows the voltage of the batteries is
insufficient. Then the rechargeable batteries need to be charged.
(3) Press the Key ON/OFF to close down the instrument.
2.3.2 Leveling
(1) When turned on, the laser beam will start to blink, It will stop winking after