6
3.2.2.
—
Calibration key
(a) When in the measurement state, press this key to enter into calibration mode.
(b)When in the non - measurement state, the key is returned as the exit key.
3.2.3.
—
Function key
(a)When in pH measurement mode, Short-time press (time<1.5s) switch the measuring
parameters, the meter will display
→
(b) When in Conductivity measurement mode, short press (less than 1.5s) the key to in
turn change measuring mode: COND
→
RES
→
TDS
→
SAL.
（
c
）
Long press(
≥
2S)switching PH and electrical conductivity measurement mode.
3.2.4.
—
Back light and data deleting key
(a) When in the measuring state, short press (less than 1.5s) to open or close the back
light display.
(b) When the storage records are queried, long press (more than 5s) to delete the saved
data.
3.2.5.
—
Adding and querying keys .
—
Reduce and store keys
(a) When in measurement mode, short time press (less than 1.5s) the key
to store
the measuring data. Short time press (less than 1.5s) the key
to recall the saved
data;
(b) When in the parameter setting state, press the two key to alter the number.
3.2.6.
—
The combination key of enter and return.
(a) When in measurement mode, long time press (more than 2s) the key to enter into
parameter setting state;
(b) When in the non measurement state, short time press (less than 1.5s) the key to
