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
0.27 Pounds
Item dimensions L x W x H
8 x 2.16 x
Material
Glass
Number of Items
1

💧Waterproof & floats

⚖️±0.1 pH accuracy

🌡️Auto temperature compensation

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Details

Brand
Bluelab
Item Weight
0.27 Pounds
Item dimensions L x W x H
8 x 2.16 x

Description

🌿 Master your pH game with precision that floats above the rest!

SMART TEMPERATURE SENSING - Automatic temperature compensation guarantees consistent accuracy regardless of conditions.
PRECISION THAT POWERS GROWTH - Achieve ultra-accurate ±0.1 pH readings for optimal nutrient uptake every time.
BUILT TO BRAVE ANY ENVIRONMENT - Waterproof design that floats and withstands drops—perfect for hydroponics, pools, and aquariums.
DESIGNED FOR THE ON THE GO PRO - Lightweight, with auto-off, low battery alerts, and a handy lanyard—never lose your edge in the field.
EFFORTLESS CALIBRATION ZERO GUESSWORK - Two-point calibration with clear 30-day reminders ensures your readings stay reliable and stress-free.

The Bluelab pH Pen is a professional-grade, New Zealand-made digital pH meter offering ±0.1 accuracy with a durable double-junction probe. Waterproof and buoyant, it’s designed for hydroponics, aquariums, pools, and soil testing. Featuring auto temperature compensation and easy two-point calibration with reminders, it ensures reliable, precise readings in any environment. Compact and user-friendly, it includes a lanyard and battery, making it the go-to tool for millennial growers and water quality pros alike.

Specifications

ASIN	B005POOJHG
Best Sellers Rank	#19,651 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #11 in Lab pH Meters #42 in Soil Meters
Brand	Bluelab
Brand Name	Bluelab
Customer Reviews	4.4 out of 5 stars 4,751 Reviews
Global Trade Identification Number	09421024920234
Item Dimensions	8 x 2.16 x 0.98 inches
Item Weight	0.27 Pounds
Item dimensions L x W x H	8 x 2.16 x 0.98 inches
Manufacturer	Bluelab Corporation Limited - Import (NZ)
Material	Glass
Material Type	Glass
Model	pH Pen
Number of Items	1
Part Number	PENPH
UPC	706842510010 715706332132
Unit Count	1.0 Count

Reviews

T**Y

30.04.2023

M**N

21.01.2021

B**3

7.01.2026

J**E

8.06.2024

M**.

11.12.2024

J**H

8.01.2025

W**E

1.02.2026

S**N

26.03.2026

J**Z

19.09.2022

A**T

14.02.2026

D**E

4.01.2023

J**O

25.01.2026

A**R

25.11.2024

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