The Bluelab OnePen is an advanced handheld nutrient measurement instrument designed to help growers monitor pH, electrical conductivity (EC), and temperature with precision and convenience. Combining multiple essential measurements in one compact device, OnePen supports confident nutrient management in hydroponic, greenhouse, and horticultural applications.
Built with a rugged, IP68-rated waterproof design, OnePen is engineered for demanding growing environments. Its digital display and connectivity with the Bluelab One App provide flexible options for taking, recording, and reviewing measurements.
One Pen. Essential Nutrient Measurements. Monitor pH, conductivity, and temperature in a single handheld instrument, with connected measurement management through the Bluelab One App.
Key Features
pH, EC & Temperature
Measure three essential nutrient-solution parameters using one compact handheld device.
Bluelab One App Connectivity
Connect to the Bluelab One App for supported measurement recording, organization, and data management.
IP68-Rated Construction
Designed to withstand wet growing environments, with a waterproof body suited to routine nutrient-solution testing.
Portable & Easy to Maintain
An integrated pen design simplifies daily measurements, cleaning, and routine instrument care.
Master the Art of Plant Health with Precision
Understanding the chemistry of your nutrient solution is fundamental to successful plant cultivation. The Bluelab OnePen brings essential measurements together in one instrument, helping growers assess nutrient availability, solution strength, and temperature conditions.
Regular testing helps identify changes in nutrient solutions and supports informed adjustments throughout the growing cycle.
Understand pH
pH measures the acidity or alkalinity of a nutrient solution. Maintaining an appropriate pH range helps support nutrient availability for different crops and growing methods.
Monitor Nutrient Strength
Electrical conductivity provides an indication of dissolved ionic salts in nutrient solutions. Monitoring EC helps growers assess overall nutrient concentration and recognize changes over time.
Track Solution Temperature
Temperature influences growing conditions and provides important context when evaluating nutrient solutions. Routine temperature measurements support consistent reservoir management.
Advanced Connectivity & Data Management
The Bluelab OnePen combines handheld measurement with connected functionality through the Bluelab One App.
The app provides supported tools for recording and reviewing measurement data, helping growers organize observations and maintain a clearer picture of nutrient-solution conditions over time.
Connected recordkeeping can be especially useful for growers managing multiple reservoirs, growing areas, or recurring measurement schedules.
OnePen can also be used as a standalone handheld meter for direct measurements. App connectivity is an additional capability, not a prerequisite for routine readings.
Built for Wet Growing Environments
OnePen features an IP68-rated waterproof design, supporting use in environments where water exposure is part of daily growing operations.
Its integrated design reduces the need to carry multiple meters when checking nutrient reservoirs, irrigation solutions, and other suitable liquid samples.
Follow the manufacturer's instructions for cleaning, storage, and protection of the sensing components to maintain dependable performance.
Applications
- Hydroponic growing: Monitor pH, conductivity, and temperature in nutrient reservoirs.
- Greenhouse production: Check nutrient solutions used in irrigation and fertigation programs.
- Water preparation: Evaluate water conditions before mixing nutrients.
- Container cultivation: Test suitable liquid samples and runoff during nutrient management.
- Horticultural research: Record measurements as part of structured growing trials and monitoring programs.
Product Specifications & Documentation
Technical Specifications
| Product | Bluelab OnePen |
|---|---|
| SKU | PENONE |
| Manufacturer | Bluelab |
| Measurement Parameters | pH, electrical conductivity, temperature |
| Conductivity | EC measurement |
| Display | Integrated digital display |
| Connectivity | Bluelab One App connectivity |
| Waterproof Rating | IP68 |
| Design | Handheld multiparameter pen |
| Application | Nutrient solutions and suitable liquid samples |
Refer to the official OnePen manual for the complete measurement ranges, resolution, accuracy, calibration, and operating specifications.
How to Use, Calibrate & Care
Taking Measurements
- Prepare the OnePen according to the manufacturer's setup instructions.
- Check that the sensing components are clean and ready for use.
- Place the sensing end into the nutrient solution being tested.
- Allow the measurement to stabilize and record the required parameter readings.
- Clean and store the instrument according to the user manual.
Calibration
Calibrate the pH measurement function using the appropriate Bluelab calibration solutions and the procedure specified in the OnePen manual.
Cleaning
Regular cleaning helps prevent deposits from affecting the sensing components. Use the cleaning method and products recommended by Bluelab.
Storage
Follow Bluelab's pH sensor hydration and storage guidance. Do not allow the pH sensing components to dry out, and do not substitute distilled or deionized water for approved pH storage solution.
Connected Operation
For app-connected functions, follow the Bluelab One App pairing and setup instructions in the user manual.
Product Manual & Documentation
Access the official Bluelab OnePen Care & User Manual for detailed operating instructions, measurement specifications, calibration, cleaning, storage, and app connectivity guidance.
View Bluelab OnePen Manual (PDF)Product Video — Bluelab OnePen
What's Included in the Box
Bluelab OnePen handheld multiparameter meter.
Refer to the manufacturer's packaging documentation for the complete list of supplied accessories and calibration or maintenance materials.