Leica DD Series Quick Manual page 5

WARNING
Working on or near live electrical utilities may cause you to receive an electric shock.
Precautions:
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Do not exceed equipment's recommended ratings and instructions of use.
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Inspect equipment's cables and accessories for damage, do not use if faulty.
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Do not work on electrically live power utilities unless you are properly qualified.
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Use personal protective equipment rated for the utilities voltage and current.
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Familiarise yourself with National and Work regulations governing safety and accident
prevention.
5 Important Information about your Instrument