Hach POCKET COLORIMETER II Instruction Manual page 81

Certification,
1. Remove power from the Pocket Colorimeter instrument by removing one of its
batteries to verify that it is or is not the source of the interference.
2. Move the Pocket Colorimeter instrument away from the device receiving the
interference.
3. Reposition the receiving antenna for the device receiving the interference.
4. Try combinations of the above.
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