Uploaded November 2025 | Updated September 2026, 1 day ago

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Here’s how to keep it in top condition:

🧪 Before first use: Hydrate the pH bulb in Bluelab KCl solution for 24 hours. Only the glass bulb should be in the solution, not the titanium electrodes.

💧 After every use: Rinse the probe in fresh tap water. Make sure the sponge in the storage cap is moist with Bluelab KCl storage solution. Add a few drops if it’s dry.

🧼 Every 30 days: Clean the pH bulb and electrodes using Bluelab pH Probe Cleaner and the brush provided. Check accuracy with Bluelab 2.77 EC solution, then recalibrate pH.

Tip: Never use RO, deionized, or distilled water. It can damage the probe.

Keep your OnePen clean, hydrated, and calibrated for reliable readings every time. 🌱

#BluelabOnePen #GrowWithConfidence #PlantCareTips #Hydroponics