Bluelab OnePen Replacement Probe - Replacement probe for Bluelab OnePen

The Bluelab OnePen Replacement Probe is designed as a replaceable measuring module for the Bluelab OnePen and represents one of the greatest advantages of this professional measuring instrument. Instead of replacing the entire instrument when the electrode wears out, you only need to replace the probe, which reduces costs and minimizes waste.

The probe combines a high-quality dual pH electrode , titanium EC electrodes and a temperature sensor , providing extremely accurate and fast measurements of all basic parameters of the nutrient solution. Thanks to the materials used, it is resistant to aggressive environments and intensive daily use.

The housing is IP68 certified, which guarantees excellent protection against water and dust. After installation, the probe is calibrated in the standard way using buffer solutions pH 7.0 and pH 4.0 and is ready for operation.

Technical characteristics

✔️ Manufacturer: Bluelab

✔️ Model: OnePen Replacement Probe

✔️ Type: Replacement Probe

✔️ Compatibility: Only with Bluelab OnePen

✔️ Measured parameters:

• pH
• EC (Electrical Conductivity)
• Temperature

✔️ pH range: 0.0 – 14.0 pH

✔️ EC range: 0.0 – 10.0 EC

✔️ CF range: 0 – 100 CF

✔️ TDS (500 Scale): 0 – 5000 ppm

✔️ TDS (700 Scale): 0 – 7000 ppm

✔️ Temperature range:

0 – 50°C

32 – 122°F

✔️ Double Junction pH technology

✔️ Titanium EC electrodes

✔️ Automatic temperature compensation

✔️ IP68 waterproof and dustproof construction

✔️ Quick and easy replacement without tools

📦 The set includes

✔️ 1 × Bluelab OnePen Replacement Probe

✔️ 1 × Buffer solution pH 7.0 (18 ml)

✔️ 1 × Buffer solution pH 4.0 (18 ml)

✔️ 1 × KCl Storage Solution (18 ml)

Advantages

✔️ You only replace the probe, not the entire device

✔️ Significantly extends the life of the Bluelab OnePen

✔️ Measures pH, EC and temperature simultaneously

✔️ Double-bonded pH electrode for longer life

✔️ Titanium EC electrodes with high resistance

✔️ High accuracy and fast stabilization of readings

✔️ Easy replacement in seconds

✔️ IP68 protection against water and dust

✔️ Reduces maintenance costs

✔️ Original spare part from Bluelab

🔧 Application

Suitable for:

• Bluelab OnePen

• Hydroponic systems

• Coconut substrate

• Soil cultivation

• Aquaponics

• Measurement of nutrient solutions

• Greenhouses

• Professional plant breeding

• Laboratory applications

📋 Method of use

1. Unscrew the old probe from the Bluelab OnePen.
2. Install the new replacement probe.
3. Calibrate the probe with the pH 7.0 and pH 4.0 buffer solutions.
4. Rinse the probe after each use with clean water.
5. Always store the electrode in the included KCl Storage Solution when the device is not in use.

⚠️ Important: The average lifespan of the probe is approximately 18 months , depending on usage and maintenance. Regular cleaning, proper storage, and periodic calibration can significantly extend its lifespan. The probe comes with a 6-month limited warranty .

💡 Tip from Urban Botaniks: If you notice slower stabilization of readings or difficulties calibrating your Bluelab OnePen, the most common cause is a worn probe. Replacing it restores factory measurement accuracy and is a significantly more economical solution than purchasing a new device.