- Point the SQM directly above (at the Zenith). The SQM sensor is on the same side as the display.
- The SQM should be held at or above head level so that shadows or reflections from your body do not interfere with the reading.
- Avoid using in areas that are shaded by trees or buildings.
- After you press the button to take a reading, the SQM will beep each second while it is accumulating photons.
The beeping will stop once the reading is ready to be viewed, face the SQM towards you at this time to note the reading.