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Bluelab One Pen
The Bluelab OnePen™ is a next-generation 3-in-1 digital meter designed for professional growers who demand precision, simplicity, and reliability. Measuring pH, electrical conductivity (EC), and temperature in one compact, waterproof device, it streamlines nutrient management and solution monitoring for all hydroponic and soil-based systems.
Engineered with Bluelab’s latest sensor technology, the OnePen™ features a double-junction pH probe and titanium conductivity electrodes for exceptional accuracy and longevity. Bluetooth connectivity allows seamless pairing with the Bluelab Edenic app, enabling live data logging, trend tracking, and calibration reminders directly from your phone. With a replaceable probe module, high-resolution readings, and an ergonomic waterproof housing, the OnePen™ offers professional-grade performance in a portable format that’s built to last.

All-in-One Precision
Measures pH, EC, and temperature simultaneously
Smart & Connected
Bluetooth-enabled for data logging, monitoring, and calibration tracking via the Edenic app
Durable Design
Rugged IP68 waterproof build with replaceable probe and titanium EC electrodesA professional 3-in-1 meter combining accuracy, durability, and wireless connectivity for complete growing precision.
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Bluelab One Pen
Key Highlights
      
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Key Highlights
      - 3-in-1 measurement: pH, EC (or CF/PPM), and temperature (°C/°F)
 - High accuracy with 0.01 pH and 0.01 EC resolution
 - Bluetooth-enabled for app integration and data logging
 - IP68 waterproof and dustproof housing
 - Replaceable probe assembly for sustainable maintenance
 - Backlit display for easy readability in all lighting conditions
 - Includes calibration and storage solutions
 
Directions for Use
      
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Directions for Use
      - Rinse the probe in fresh water before use.
 - Submerge the probe in your nutrient or water solution.
 - Wait for the readings to stabilise, then view pH, EC, and temperature values on the screen.
 - After use, rinse thoroughly and store with KCl solution in the protective cap.
 - Calibrate regularly using Bluelab pH 4.0 and 7.0 solutions, following on-screen or app-guided prompts.
 
Technical Specifications
      
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Technical Specifications
      - Measurement Parameters: pH, EC (or mS/cm), CF, PPM (500 & 700), Temperature (°C/°F)
 - pH Range: 0.0 – 14.0
 - pH Resolution: 0.01
 - Accuracy @ 25 °C (77 °F): ± 0.05
 - Temperature Range: 0 – 50 °C (32 – 122 °F)
 - Temperature Resolution: 0.1 °C (0.1 °F)
 - Accuracy: ± 1 °C (± 1 °F)
 - EC Range: 0 – 10 mS/cm
 - EC Resolution: 0.01 mS/cm
 - EC Accuracy: ± 0.1 mS/cm
 - CF Range: 0 – 100
 - CF Resolution: 0.1
 - CF Accuracy: ± 1
 - PPM 500 Range (TDS): 0 – 5000 ppm
 - TDS Resolution: 5 ppm
 - TDS Accuracy: ± 50 ppm
 - PPM 700 Range: 0 – 7000 ppm
 - PPM 700 Resolution: 7 ppm
 - PPM 700 Accuracy: ± 70 ppm
 - Power Supply: 2 × AAA alkaline batteries
 - Connectivity: Bluetooth (Bluelab Edenic App compatible)
 - Operating Environment: 0.2 EC and above | 0 – 50 °C (32 – 122 °F)
 - Warranty: 2 years for OnePen™, 6 months for replacement probe
 - Box Contents
1 × Bluelab OnePen™ with Replaceable pH, EC, and Temperature Probe
1 × Bluelab Sensor Cleaning Brush
1 × Bluelab pH 7.0 Calibration Solution (18 ml single-use sachet)
1 × Bluelab pH 4.0 Calibration Solution (18 ml single-use sachet)
1 × Bluelab KCl Storage Solution (18 ml single-use sachet) 
Resources
      
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Shipping & Returns
      
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Shipping & Returns
      We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at info@hydrooasis.com.au
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at info@hydrooasis.com.au.