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).

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.

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.

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.

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.

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

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

Product ID: 4206087

Details

Brand
Bluelab
Item Weight
4.32 ounces
Item dimensions L x W x H
8 x 2.16 x
Material
Glass
Number of Items
1

💧Waterproof & floats

⚖️±0.1 pH precision

🌡️Auto temperature compensation

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Description

🌿 Elevate your grow game with precision that never quits!

PRECISION THAT POWERS GROWTH - Achieve ultra-accurate ±0.1 pH readings for optimal nutrient uptake and thriving crops.
BUILT TO BRAVE ANY ENVIRONMENT - Waterproof design that floats and withstands drops—perfect for hydroponics, pools, and aquariums.
SMART CALIBRATION ZERO GUESSWORK - Easy two-point calibration with a 30-day reminder on a backlit LCD keeps your measurements flawless.
DOUBLE JUNCTION PROBE FOR LONGEVITY - Minimizes contamination and extends probe life, ensuring consistent, reliable readings over time.
DESIGNED FOR THE PRO GROWER ON THE GO - Auto-off, low battery alert, and included lanyard keep your pH pen ready and accessible wherever you work.

The Bluelab pH Pen is a professional-grade, waterproof pH meter featuring ±0.1 accuracy, a durable double-junction probe, and automatic temperature compensation. Designed in New Zealand for growers and water quality pros, it offers easy two-point calibration with a 30-day reminder, floats for safety, and a rugged build to handle tough environments. Ideal for hydroponics, aquariums, pools, and soil testing, it ensures your pH and temperature stay in the perfect range for maximum nutrient uptake and plant health.

Specifications

ASIN	B005POOJHG
Best Sellers Rank	#10,731 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #15 in Lab pH Meters #51 in Soil Meters
Brand Name	Bluelab
Customer Reviews	4.4 4.4 out of 5 stars (4,760)
Global Trade Identification Number	09421024920234
Item Dimensions	8 x 2.16 x 0.98 inches
Item Weight	4.32 ounces
Manufacturer	Bluelab Corporation Limited - Import (NZ)
Material Type	Glass
Model	pH Pen
Part Number	PENPH
UPC	706842510010 715706332132
Unit Count	1.0 Count

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E£ 14989

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In stock

Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to EGYPT.

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