Water Test
ON / OFF
4 pH 7
RANGE
HI 7004
µS
pH
mV
Water Test
ON / OFF
4 pH 7
RANGE
Water Test
ON / OFF
4 pH 7
RANGE
pH
Water Test
ON / OFF
4 pH 7
RANGE
HI 7004
pH
°C
Water Test
ON / OFF
4 pH 7
RANGE
HI 7007
Water Test
ON / OFF
4 pH 7
RANGE
HI 7031
ON / OFF
RIGHT
SIDE
RANGE
µS
°C
ON / OFF
RANGE
RANGE
Water Test
ON / OFF
4 pH 7
RANGE
RANGE
OPERATION
• Do not be alarmed if white crystals appear around
the cap. This is normal with pH electrodes and
they dissolve when rinsed with water.
• Take a sample of the water to be tested and pour
into the black compartment of the Water Test.
If you are scooping up the water with the black
compartment, do not immerse above the indicated
maximum immersion level.
• Turn the tester on by pressing the ON/OFF
key on the front panel.
• The tester will enter the temperature mea-
surement mode, indicated by the "°C" sym-
bol on the display.
• Press the RANGE key once to enter the
conductivity (µS/cm) mode.
• Press the RANGE key again to display pH.
• Press the RANGE key once again to dis-
play ORP (mV).
• If the tester compartment has been left dry
for more than 2 days, wait for about 5 min-
utes before taking pH measurements.
• For more accurate measurements, make sure that Water Test is
calibrated for pH and conductivity before use.
• After measurements, empty the compartment, rinse it with tap water
and switch the tester off by pressing the ON/OFF key.
• When the tester is not in use, fill the compartment
with tap water.
For long term storage, keep the tester in its origi-
nal box.
NEVER USE DISTILLED OR DEIONIZED WATER
FOR STORAGE PURPOSES.
pH CALIBRATION
• Pour a small quantity of distilled water into the
black compartment, rinse by shaking the compart-
ment and then discard the content.
• Pour a small quantity of pH 7 (HI 7007) buffer solu-
tion into the compartment and switch the tester on
by pressing the ON/OFF key.
• Press the RANGE key until the display enters the
pH measurement mode.
• Adjust the right trimmer located behind
the front cover until the display shows "7.0
pH".
• Discard the pH 7 solution and rinse the
compartment with distilled water.
• Pour a small quantity of pH 4 (HI 7004) or
pH 10 (HI 7010) buffer solution into the com-
partment.
• Adjust the left trimmer located behind the
front cover until the display shows "4.0 pH"
or "10.0 pH".
• Discard the buffer solution and rinse the
compartment with distilled water.
• The unit is now calibrated for pH and ready
for use.
CONDUCTIVITY CALIBRATION
• Rinse the black compartment with distilled
water, then fill it with HI 7031 conductivity so-
lution to overflow and switch the tester on by
pressing the ON/OFF key. The temperature
of the solution will be displayed.
• Note the temperature of the solution and read
the corresponding conductivity from the table
on the solution bottle label (e.g. 1413 µS/cm
@25°C).
• Remove the screw on the right side of the casing to access the
conductivity calibration trimmer. Press the RANGE key to display
the conductivity measurement mode and adjust the trimmer
until the display shows the conductivity reading at the noted tem-
perature (e.g. 1278 µS/cm @20°C). Replace the screw after calibra-
tion.
°C
°F
HI7031
(µ
S/cm)
0
32
776
5
41
896
10
50
1020
15
59
1147
16
60.8
1173
17
62.6
1199
18
64.4
1225
19
66.2
1251
20
68
1278
21
69.8
1305
°C
°F
HI7031
(µ
S/cm)
22
71.6
1332
23
73.4
1359
24
75.2
1386
25
77
1413
26
78.8
1440
27
80.6
1467
28
82.4
1494
29
84.2
1521
30
86
1548
31
87.8
1575
ALWAYS USE FRESH BUFFERS
FOR CALIBRATION
