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Bluelab

Q: Why should I choose the Bluelab pH pen over others?

The probe quality. Highly accurate, compensates for temp & is fast to a stable reading. It's a double junction probe, so it's durable. And it's full of thoughtful touches (the ring on top, the storage cap, the calibration indicator to name a few).

Q: Other pens come with a hard carry case & calibration solutions in plastic bottles. Yours does not. Why is that?

Great question. We have made the deliberate choice to make our packaging as sustainable as possible. To that end, our packaging is all fully recyclable, with no hard plastics or styrofoam inserts.

Q: How does Bluelab make calibration super easy?

Calibrating is an easy & fast process! Each pen includes calibration solutions & clear instructions. A check mark appears when the pen is calibrated. When the pen loses calibration, the check mark disappears, informing you it's time to recalibrate.

Q: I sometimes see a white crust built up on the end of the pen. What is this?

This is very common in pH meters & is nothing to worry about. The storage solution used to hydrate your pen (and extend its longevity) is potassium salt, which sometimes dries as a white crust on your probe. Simply rinse this away under water.

Q: Can I use the pH Pen to measure the pH of tap water, distilled water, or reverse-osmosis water?

No. For distilled & RO water there aren't enough dissolved ions (salts) for a stable pH reading. For tap water, w/o sufficient dissolved minerals, the answer is also no. Adding a few drops of KCL storage solution may work to enable a stable reading.

Product ID: 4206087

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💧Waterproof & floats

⚖️±0.1 pH precision

🌡️Auto temperature compensation

Frequently Bought Together

bluelab pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ

Bluelab pH 4.0 & 7.0 Calibration Solution Kit - pH Meter & pH Pen Calibration for Balanced Nutrient Solution NIST Traceable | Hydroponics, Gardening & Growing Tents (500 ml/ 16.9 Fl Oz Each)

Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow White

Description

🌿 Master your pH game—because precision is the new power move.

BUILT TO BRAVE THE ELEMENTS - Waterproof casing and floating design mean no fear of drops or deep dives—reliability wherever you go.
PRECISION THAT POWERS GROWTH - Ultra-accurate ±0.1 pH readings ensure your crops and water systems thrive with perfect balance.
DESIGNED FOR THE MODERN GROWER - Auto-off, low battery alert, and hands-free lanyard combine convenience with professional-grade performance.
SMART CALIBRATION ZERO HASSLE - Two-point calibration with included sachets and a 30-day calibration reminder keeps your meter always ready.
DOUBLE JUNCTION PROBE FOR LONGEVITY - Minimizes contamination and extends probe life, delivering consistent, trustworthy measurements.

The Bluelab pH Pen is a professional-grade, waterproof pH meter with ±0.1 accuracy, featuring a durable double-junction probe and automatic temperature compensation. Designed for hydroponics, aquariums, pools, and soil testing, it offers easy two-point calibration with included solutions, a floating design for durability, and user-friendly features like auto-off and low battery alerts. Made in New Zealand, it’s built to deliver reliable, precise readings in demanding environments.

Have a Question? See What Others Asked

Why should I choose the Bluelab pH pen over others?

Other pens come with a hard carry case & calibration solutions in plastic bottles. Yours does not. Why is that?

How does Bluelab make calibration super easy?

I sometimes see a white crust built up on the end of the pen. What is this?

Can I use the pH Pen to measure the pH of tap water, distilled water, or reverse-osmosis water?

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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