Offsetting Sensor Drift - General VOC08 Hardware Manual

Do not drop or disassemble the meter or immerse it in water.
The VOC08 may display the following two sensor error
messages on its bottom readout:
E- 1: The VOC, temperature or RH sensor is damaged, or
communication with any of the sensors has failed.
E- 2: The VOC, temperature or RH level is beyond the
range of its sensor.
If the LCD persistently shows a value of 00000 for VOC, that
usually means that a logging session was initiated before the
VOC sensor was fully warmed up.

OFFSETTING SENSOR DRIFT

The meter uses a capacitive RH sensor and a thermistor
temperature sensor whose accuracy may drift over the long
term. Following is a procedure that you can perform to offset
these drifts and maximize the meter's measurement
accuracy.
1) With the meter powered off, press and hold the MODE
and BKLT buttons with fingers of your left hand while
pressing and holding the MAX/MIN and PWR buttons with
fingers of your right hand.
2) When the LCD shows 0.0°C and SET, release all four
buttons.
3) To select °C or °F as the temperature offset unit, press the
UNIT button.
4) Press the HOLD button once for each 0.1° of temperature
offset you wish to add, or the BKLT button once for each
0.1° of temperature offset you wish to subtract.
5) To offset RH drift instead of, or in addition to, temperature
drift, briefly press the SET button. This will change the
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