6
2.&3. [STAND] and [SLOPE] keys：The [STAND] and [SLOPE] keys
are used for dual point pH calibration of the
instrument.
Pressing and holding the [STAND] key while
turning on the power ,will chang the buffer set
to the other available buffer set.
4.[MEA./EFF.] key ：a. The [MEA./EFF.] key is used to bring
the instrument out of the AUTOLOCK condition
when operating in the pH-AUTOLOCK or mV-AUTOLOCK
mode.
b. Press and hold this key for 5 seconds, the
large LCD will display the efficiency of the
electrode.
5.&6. The [
∆
] and [
∇
] keys ：The [
∆
] and [
∇
] keys
are used to manually enter the temperature
values. They have no effect on the instrument
when operating in ATC mode.
7. [CLEAR] key ： The [CLEAR] key is used to clear all
calibration values stored in the internal
memory. Under normal use the key will not be
activated unless pressed and held for 2 seconds.
8.[ON/OFF] key ：The [ON/OFF] key turns the instrument on or
off. The pH calibration values will not be
erased when the instrument is turned off.
