5
Fu
NCT
iONAL
D
ESC
ri
PT
iON
& LCD Di
SPLA
y
3. FUNCTIONAL DESCRIPTION & LCD DISPLAY
pH
On/Off
ppm
°C
CAL
pH
HI9812-51
EC
TDS
µS/cm
pH
solution and turn the knob
Dip probe in calibration
for current temperature
to match the solution value
1
3
2
5
6
7
8
9
10
11
4
12
1. 8-pin DIN connector socket
2. Battery-level indicator
3. LCD display
4. On-screen calibration knob indicator
5.
pH
key – pH range selection
6.
µS/cm
key – EC range selection
7.
ppm
(mg/L) key – TDS selection
8. pH calibration knob
9. EC / TDS calibration knob
10. Temperature (
°C
) selection key
11. On/Off key
12. On-screen tutorial messages
