Sper Scientific 850069 Environmental Quality Meter w/Sound - Manual (Page 15)

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MEASUREMENT PROCEDURES
3. Press LUX/FT-CD to select between
Lux and Ft-cd.
4. To ensure measurement accuracy,
calibrate the light meter using the Zero-
Offset adjustment feature.
5. Cover the light sensor to block any light
from registering on the meter. Press
ZERO
to calibrate the meter to zero.
The meter displays the light-level value
as 0 and is ready to measure light,
even in low-lit and dark areas.
6. Uncover the light sensor and ensure
that the light sensor on the front of the
meter is pointing toward the lumination
subject and is free from obstruction.
7. The meter measures the light level of
the surrounding environment and
displays the reading.
When measuring intense light, the
meter displays x10 to indicate that the
value displayed is
1/10
the actual value.