How To Clean Your Onepen™ Probe; Replacing Your Onepen™ Probe - bluelab OnePen User Manual

3.2 How to clean your OnePen™ probe
Cleaning is essential for accurate pH and EC readings. Without proper cleaning, your
readings may drift.
To clean your OnePen™ probe, follow the steps below.
1. Rinse in fresh tap water.
2. Mix some Bluelab pH probe cleaner in a small container of fresh water.
3. Dip the provided brush in this solution and gently scrub the EC electrodes
and rinse under running tap water.
4. Then gently stir the probe in the solution, taking care not to break the glass
bulb before leaving to soak for 5 minutes in the cleaning solution.
5. Rinse again under running tap water.
After cleaning perform a pH calibration and 2.77EC check.
Note: For heavily soiled probes, soak the probe in solution of 10% citric acid or white
vinegar and pH probe cleaner overnight. For stubborn deposits use a Q-tip to remove
them.
IMPORTANT: Do not user abrasive cleaners to clean the EC electrodes or pH bulb.
3.3 Replacing your OnePen™ Probe:
1. Carefully remove the storage cap.
2. Turn the pen upside down to ensure the batteries remain in place.
3. Unscrew the threaded collar and remove the old probe from the pen body.
4. Remove the protective cap on the new probe.
5. Carefully replace the probe in the pen, lining up the arrow on the top side of
the probe with the corresponding notch on the pen body.
6. Push the probe all the way in. The arrow should sit perfectly into the notch.
7. Secure probe with the threaded collar. Twist to ensure fully tightened.