Instruction manual

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1. Power on/off key: long press to power on, shot press to power off.
2. Unit selection key: under measuring state, press this key to switch the unit of
reading between Lux and FC
3. Maximum value and minimum value selection key: under measuring state, press
the key to switch between normal measurement, MAX and MIN in order of
normal measurement→MAX →MIN. When “MAX” or “MIN” sign is displayed
on LCD, the luminometer just displays the maximum reading value or the
minimum reading value.
4. Auto range and Manual range selection key: in auto range state, press the key to
enter manual range state; press once again to enter low range and high range
one by one; long press the key to return to auto range state.
5. Data memory and delete key: press this key to save measured data automatically
or manually, the biggest storage capacity: 2044 pieces; press this key and power
on the meter at the same time, you can delete the recorded data.
6. Menu key: long press this key to enter the function setting mode; short press this
key again to enter next function in order of USB/APO/SEC/CODE/DEF？/ normal
measurement; press HOLD key to exit menu mode.
7. Data hold key: press this key to lock the measured data display on LCD, and
display “HOLD” sign at the same time; press this key again to exit hold function.
UT381/382 Instruction Manual