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7 pH Measurement
Short press
to turn on the tester. Rinse the probe in distilled water and dry it. Dip the probe in
sample solution, stir gently, and allow it to stand still in the solution. Get readings after
comes
up and stays on screen.
Notes
For solutions with low ionic strength (e.g. distilled or deionized water), the pH measurements will
be fluctuating and difficult to get a stable reading. A specialized pure water pH electrode is
required. For more information, please contact us at [email protected]. Likewise, when testing
clean water such as drinking water, RO water or tap water, the test time could be longer, usually 2-
4 minutes.
7.1 Applications of different models
Model/Probe
Application
PH60-Z – glass bulb
sensor
General water solutions’ pH measurement such as hydroponics,
aquaculture, pools and spas, water treatment, beverage, etc.
PH60S-Z – Spear tip
sensor
Solid samples such as cheese, meat, fruit, vegetables, sushi rice,
bread, and soil; also works well for general water solution.
PH60F-Z – Flat glass
membrane
Flat surface measurement such as skin, paper, fabric, leather and
so on; micro sample testing; also works well for general water
solution.
1) PH60S-Z Spear pH testers are widely used for solids containing water or semi-solid medium.
When performing such tests, pay attention to insert probe evenly, and be careful to prevent
probe from damage. If the medium is too hard (such as meat or fruits), please bore a small
hole with a knife before inserting the probe.
◼
For food pH measurement (e.g. sushi, cheese, meat, fruit, etc.), it should always be a sampling
test. That means test samples should no longer be edible.
2) For soil direct pH test with PH60S-Z
a)
If soil is dry, add small amount of distilled or RO water to moisten the soil (do NOT add tap water
since it will affect the pH value significantly). Ideally wait 24 hours before you take a
measurement.
b)
Rinse the probe with distilled water/RO water before inserting it to the soil.
c)
If measuring outside of solution, rockwool or small pots, remove the top 5cm/2inch soil from the
surface of the sample area. Insert the spear probe approximately 4 to 6 inches (10 to 15cm) into
the soil samples from various locations (3 to 4), wait for the stable readings before recording
(smiley face icon stays on the screen).
d)
Users can save all the data in ZenTest App. Then take the average of the saved data as the
representative pH level of the soil.
e)
Do NOT use extra force to insert probe. If you feel like the probe can’t be inserted any deeper,
stop inserting. The spear tip could break.
f)
Rinse off the soil residue between tests using distilled water or RO water for the best results.
Use the probe cleaning brush if needed.
