Etymotic ER•200DW8 Personal Noise Dosimeter with Data Logging - Manual (Page 7)

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Using the Windscreen
For accurate measurements, the 35 mm (1.4”) windscreen
included with the ER-200DW8 should be used when noise
is measured outdoors or near any turbulence, e.g., from a
fan. The foam windscreen allows accurate measurement in
winds up to 15 to 20 mph.
Note: Blowing across the microphone opening on
the dosimeter can cause the same turbulence as a
50 mph wind.
The windscreen contains a plastic pin on the interior to
anchor it to the ER-200DW8. To attach the windscreen,
carefully pull the foam back to visualize the pin. Place the
pin in the windscreen socket at the top of the ER-200DW8.
Gently pull the foam down over the top of the dosimeter
case. To remove the windscreen, grasp the windscreen
and pin and pull straight out.