• If the display does not show "7.0 pH",
adjust the right trimmer located behind
the cover until the display shows "7.0 pH".
• Discard the pH 7 solution, pour a small
quantity of distilled water into the black
compartment, rinse by shaking the com-
partment and then discard the content.
• Pour a small quantity of pH 4 (HI 7004) or
pH 10 (HI 7010) buffer solution into the
compartment.
• If the display does not show "4.0 pH" (or
"10.0 pH"), adjust the left trimmer lo-
cated behind the cover until the display
shows "4.0 pH" (or "10.0 pH").
• Discard the pH 4 (or pH 10) solution, pour a small quantity of
distilled water into the black compartment, rinse by shaking the
compartment and then discard the content.
• The unit is now calibrated for pH and ready for use.
CONDUCTIVITY CALIBRATION
• Pour a small quantity of distilled water into the black
compartment, rinse by shaking the compartment and
then discard the content.
• Fill the compartment with HI 7031 conductivity solu-
tion to overflow and switch the tester on by
pressing the ON/OFF switch. The tempera-
ture of the solution will be displayed.
• Note the temperature of the solution and
read the corresponding conductiv-
ity from the table printed on the
solution label (e.g. 1413 µS/cm
@ 25°C).
• Remove the screw on the right of
the casing. Press the RANGE
switch to display conductivity
measurements and adjust the
trimmer on the right of the cas-
i n g u n t i l t h e d i s p l a y
shows the corresponding
conductivity reading at the
noted temperature (e.g.
1278 µS/cm @20°C). Re-
place the screw after cali-
bration.
ALWAYS USE FRESH BUFFERS
FOR CALIBRATION & NEVER REUSE THEM.
OPERATING INFORMATION
• Do not be alarmed if white crystals appear around the
cap. This is normal with 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 com-
partment, do not immerse above the maximum im-
mersion level indicated.
• Turn the tester on by pressing the ON/OFF
switch on the front panel.
• The tester will automatically default the tem-
perature measurement indicated by the "°C"
symbol on the display.
• Press the RANGE switch once to display
the conductivity expressed in µS.
• Press the RANGE switch once more to dis-
play pH.
• Press the RANGE switch once again to display ORP
expressed in mV.
• If the tester compartment is dry for more than 2
days, you will have to wait for about 5 minutes be-
fore taking pH measurements.
• In order to take more accurate pH and conductivity measurements,
make sure that Water Test is calibrated for pH and conductivity
before use.
• When the measurements are completed, empty the com-
partment, rinse with tap water to minimize contamination
and switch the tester off by pressing the ON/OFF switch
again.
• In order to have a fast response time during mea-
surement, the compartment of the tester should be
filled with tap water when the tester is not in use.
For long term storage, the tester should be kept in the
original box.
DO NOT 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 com-
partment and then discard the content.
• Pour a small quantity of pH 7 (HI 7007) buffer
solution into the compartment and switch the
tester on by pressing the ON/OFF switch.
• Press the RANGE switch twice to display pH measure-
ments.
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
H
I 7
0
0
4
pH
°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
°C
Water Test
ON / OFF
4 pH 7
RANGE
H
I 70
07
ON / OFF
Water Test
ON / OFF
4 pH 7
RANGE
H
I 7
0
3
1
ON / OFF
RIGHT
SIDE
RANGE
µS
°C
ON / OFF
RANGE
ON / OFF
RANGE
Water Test
ON / OFF
4 pH 7
RANGE