EG AIR EGVOC-100, Руководство пользователя

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Why are there significant differences in HCHO and
TVOC readings at different times?
There can be large variations in formaldehyde (HCHO) and TVOC
readings within a house on different days and in different rooms.
The total volatile organic compound (TVOC) readings can vary by
magnitude of 10 or more on different days. Anything from cooking to
perfume to body odor near the device can cause large variations in the
TVOC readings. Think of the device as a very sensitive electronic nose.
Remember to calibrate ESPECIALLY if you are getting inaccurate
readings or after storage as most product boxes are made from a large
amount of synthetic materials that emit HCHO and TVOC's and can
cause inaccurate readings.