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

Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe

Product ID: 4206087

Details

Brand
Bluelab
Item Highlight
Waterproof and
Item Weight
4.32 ounces
Item dimensions L x W x H
8 x 2.16 x
Material
Glass

⚖️±0.1 pH precision

🌡️Auto temperature compensation

🛡️Durable double-junction probe

₩205048

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Description

🌿 Master your pH, master your growth—precision that cultivates success!

PRECISION THAT POWERS GROWTH - Achieve ultra-accurate ±0.1 pH readings to optimize nutrient uptake and maximize your crop’s potential.
VERSATILE WATERPROOF DESIGN - Floats and resists water damage, perfect for hydroponics, aquariums, pools, and brewing—your all-in-one pH solution.
SMART TEMPERATURE COMPENSATION - Automatic temperature adjustment guarantees precise pH readings regardless of environmental changes—no guesswork needed.
BUILT TO LAST BUILT FOR ACCURACY - Durable double-junction probe minimizes contamination and extends lifespan—because your success deserves reliability.
EFFORTLESS CALIBRATION INSTANT CONFIDENCE - Two-point calibration with included pH4, pH7, and KCl sachets ensures your meter is always ready to deliver trusted results.

The Bluelab pH Pen offers professional-grade ±0.1 pH accuracy with a durable double-junction glass probe designed to resist contamination and extend lifespan. Featuring automatic temperature compensation and easy two-point calibration, this waterproof, floating meter is ideal for hydroponics, aquariums, pools, and brewing applications. Made in New Zealand, it ensures reliable, fast, and precise pH monitoring to optimize nutrient uptake and maximize crop or water quality.

Specifications

ASIN	B005POOJHG
Best Sellers Rank	#9,023 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Lab pH Meters #28 in Soil Meters
Brand	Bluelab
Brand Name	Bluelab
Customer Reviews	4.4 out of 5 stars 4,781 Reviews
Global Trade Identification Number	09421024920234
Item Dimensions	8 x 2.16 x 0.98 inches
Item Highlight	Waterproof and Floats - Auto Temperature Compensation - Made in NZ
Item Weight	4.32 ounces
Item dimensions L x W x H	8 x 2.16 x 0.98 inches
Manufacturer	Bluelab
Material	Glass
Material Type	Glass
Model	pH Pen
Number of Items	1
Part Number	PENPH
UPC	706842510010 715706332132
Unit Count	1 Count

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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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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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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₩205048

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered 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 South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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