2NoiseMetersCEL24xPowerFitting Batteries1. Open the Battery Cover2. Check the compartment is clean and dry3. Fit three new AA Alkaline or NiMH4. Close the battery coverSwitching On and OffPress the red On/Offbutton to switch themeter on.During power up the datalogging models will showthe current time andmemory settings.Observe polarity whenfitting batteriesDo not mix battery types