Bluelab OnePen – Precision Monitoring for pH, EC, and Temperature

All-in-one simplicity for precise plant care. The Bluelab OnePen combines pH, electrical conductivity (EC), and temperature monitoring into a single, compact device. Perfect for growers who value accuracy and convenience, this portable meter ensures your plants receive the ideal conditions for optimal growth, whether in hydroponics, soil, or container gardening setups.

Why Choose the Bluelab OnePen?

The Bluelab OnePen is the ultimate tool for growers who demand versatility and reliability. Its lightweight design and robust functionality make it easy to monitor essential parameters on the go, ensuring your plants always have what they need to thrive.

• 3-in-1 functionality: Accurately measures pH, EC, and temperature with one device.
• Portable and compact: Ideal for quick checks and on-the-go monitoring.
• Durable design: Built to withstand tough growing environments with waterproof construction.
• Easy calibration: Quickly calibrate for precise, reliable readings.

How to Use

Using the Bluelab OnePen is simple and efficient:

1. Calibrate: Use Bluelab calibration solutions to prepare the pH probe for accurate readings.
2. Measure: Submerge the probe into your nutrient solution, soil slurry, or hydroponic reservoir.
3. Monitor: View pH, EC, and temperature readings on the clear digital display.
4. Maintain: Rinse the probe with clean water after each use to ensure longevity and accuracy.

Product Specifications

• Type: Portable pH, EC, and temperature meter
• Readings: Accurate measurements for pH, electrical conductivity, and temperature
• Durability: Waterproof and designed for demanding grow environments
• Power: Battery-operated for convenience
• Best for: Hydroponics, soil, and container gardening

Why Bluelab?

The Bluelab OnePen is trusted by professional growers and hobbyists worldwide for its accuracy, reliability, and ease of use. Combining three critical measurements in one device, it simplifies nutrient management, giving you more time to focus on growing your best plants.

Order Yours Today

Streamline your nutrient management with the Bluelab OnePen. Click below to return to the Add to Cart section and take the guesswork out of plant care today.

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Shipping Information

Reliable tools deserve exceptional service. Orders to the US and Canada arrive in just 2–10 business days. Spend over $125, and shipping’s on us—it’s our way of saying thank you (conditions apply). For details, see our Shipping Policies.

Returns & Exchanges

Your satisfaction matters. Return your purchase within 30 days, hassle-free, as long as it’s unopened and in its original condition. Learn more in our Returns & Exchanges Policies. Shop confidently—your peace of mind is guaranteed.