How to use
1. Insert the blue BNC connector of the electrode to the BNC socket of your pH meter while twisting
clockwise until it’s locked.
2. Before measuring, twist off the storage bottle cap (see graph on the right), pull
out the electrode and rinse it off with distilled or deionized water.
3. Perform at least a two-point calibration before measuring after connecting the
new electrode to your pH meter.
4. Spear pH Electrode is suitable for measuring wet solids or semi-solid
mediums. Be careful not to use excessive force when piercing the electrode
into samples. If the sample medium is too hard, please cut a small hole with a
knife before piercing the electrode into it.
5. After using, put the electrode back into the storage bottle and twist on the bottle cap.
Maintenance
1. When not in use, the electrode should be soaked in the storage bottle containing 3M KCL soaking
solution to keep the glass membrane and junction in a healthy condition. Clean the bottle and replace
the soaking solution if it gets contaminated. The electrode should never be stored in pure water such
as deionized or distilled water.
2. The electrode is only as accurate as it is clean. Always thoroughly rinse off the probe before and after
each measurement with pure water in a container or with a wash bottle.
3. The transparent polymer gel electrolyte will inflate and ooze out a bit when it’s soaked in KCL solution.
This will not affect the measurement of the electrode, and it will happen more frequently with newer
electrodes. This is a “self-clean” situation especially when the junction gets contaminated. Just wipe
off the inflated gel with clean tissue and continue to use the electrode as normal.
4. For tough contaminants, soak the electrode in Apera cleaning solution (AI1166) for 30 minutes. Then
use a soft brush to remove the contaminants. Afterwards, soak the electrode in 3M KCL soaking
solution for at least 1 hour. Rinse it off, then re-calibrate it before using again.
5. The connector of the electrode should be kept clean and dry. If contaminated, please clean it with
medical cotton and isopropyl alcohol and blow-dry it to prevent short circuit of the electrode or slow
response of the electrode.
6. The electrode should avoid testing strong acid and strong alkali solutions, as well as dehydrating
media such as absolute ethanol and concentrated sulfuric acid. If testing such solutions, the
