General Tools and Instruments WBGT8778 - Manual (Page 7)

Note:
The RH value difference between the
meter display and calibration standard
should be within +/-0.3%, otherwise
it is a failed calibration.
The blinking “7X.X%” shows on the
screen and meter is now calibrating.
Wait about 60 mins.until blinking stops
,it means the calibration is completed
and meter returns to measuring mode.
6
75% calibration
After 33% calibration, plug the sensor
probe into 75% salt bottle, then press
for 2 seconds to start.
MODE MODE
33% calibration
Plug the sensor probe into 33% salt
bottle(Pic A1),hold down , ,and
buttons for 2 seconds to power on the
meter until blinking “3X.X%” appears.
Meter is now calibrating, and will finish
in about 60 mins. when the value stops
blinking.
Note:
Strongly recommend to use one hand to
press one button, and use two fingers
of the other hand to press two buttons
simultaneously . This is easier for you
to operate 3 keys.
MODE MODE
NEXT NEXT
Pic.A1
Salt solution