Sper Scientific 800046 Indoor Air Quality Meter - Manual (Page 14)

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The meter defaults to calibration levels of 33% humidity and
75% salt solution. The recommended ambient condition is
25°C with stable humidity (close to the calibrating value). To
abort RH calibration, turn the meter off.
Caution…
Do not calibrate humidity without the calibration salt as
doing so may cause permanent damage. Contact Sper
Scientific for calibration salt or services.
RH CALIBRATION
33% Calibration
1. Plug the sensor probe into a 33% salt bottle.
2. With the meter in Normal mode, hold CAL and DP/WBT
simultaneously to enter the 33% calibration mode.
3. “CAL” and the calibrating value (32.7% if at 25
°
C) will
blink on the LCD with the current temperature displayed
on the left.
4. Meter calibration is completed in approximately 60
minutes when “CAL” and humidity stop blinking, and the
meter returns to Normal mode.