Eli Ezer ERK-9200, Руководство по эксплуатации

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2.5 Environment of installing the device
Avoid installing the device on a place where it is exposed to direct sunlight or
near the illumination.
Be sure to install the blind when installing the ERK-9200 near to the window.
Exposure to the direct sunlight or too bright indoor lights may influence on the
result of accurate measurment.