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Bluelab pH Pen
Bluelab pH Pen
Bluelab pH Pen
Bluelab pH Pen
PENPH

Bluelab pH Pen

A compact meter for quick and easy pH and temperature readings in solution.

Help manage crop health by ensuring optimal nutrient uptake through accurate pH measurements. Pair it with our Bluelab Conductivity Pen for a complete measurement system. 

Features:

  • Compact handheld design for convenient use
  • Bright, easy-to-read backlit display
  • Double-junction pH probe for accurate measurements
  • Simple 2-point pH calibration with a 30-day reminder
  • Read temperature in °C or °F
  • Waterproof and floats in any solution
  • Product manual
  • Technical specifications

Check out the new pH PenPlus with replaceable probe

Bluelab pH PenPlus

Bluelab pH PenPlus

An accurate & reliable pH & temperature pen

Perfect for quick and easy pH and temperature readings direct from your solution.

Watch Video

Get the fundamentals of growing right, every time

Healthy growing plants, just like humans, need a balanced diet of appropriate nutrients (food). However, plants can only access these nutrients when the nutrient solution is within a certain pH range.

From a water chemistry perspective, pH (potential Hydrogen) plays a pivotal role in making the nutrients in your solution soluble so that they can be accessed by your plants. That’s why if your growing solution becomes too acidic or too alkaline, the plants won’t be able to get access to the nutrients they need to grow. The temperature of your growing solution is equally important as having a solution that’s too hot or too cold can affect growth rate and structure.

To help your plants thrive, get the fundamentals right by measuring pH and temperature to ensure that these are always in the optimal range.

Precision Meets Everyday Growing

Your go-to tool for quick, accurate pH readings. The Bluelab pH Pen is a hardy, easy-to-use handheld meter that delivers precision in 0.1 pH increments. It is fully temperature compensated to ensure reliable readings every time, helping you maintain the ideal environment for healthy plant growth.

Built in New Zealand. Trusted by growers worldwide. Designed with durability and simplicity in mind, the Bluelab pH Pen is one of our top-selling tools. It is relied on by growers around the globe and is an essential part of any growing setup.

Pair it with the Bluelab Conductivity Pen for the full picture. Use the Bluelab Conductivity Pen alongside your pH Pen to measure nutrient levels (EC/ppm) and confirm your feeding is on target.

Bluelab Waterproof pH Pen

Find the right product for your needs

Compare to other Bluelab products

Product name
Price
Growing method
Parameter
Type
Recommended for
Warranty
Connected
Replaceable pH Probe
Current product
Bluelab pH Pen
Bluelab pH Pen
Solution
pH Temperature
Handheld
Home Growers
1 year
No
No
Comparison product
Bluelab pH PenPlus
Bluelab pH PenPlus
Solution
pH Temperature
Handheld
Home Growers Commercial Growers
2 years
No
Yes
View product
Comparison product
Bluelab OnePen
Bluelab OnePen
Solution
Conductivity (EC) pH Temperature
Handheld
Home Growers Commercial Growers
2 years
Yes
Yes
View product
  • Always the most consistent and accurate. Easy to use with quick readings.
  • Most reliable and accurate PH meter on the market. Super easy to use and calibrate.
  • Speed and accuracy...love the fact it tells you when you got it calibrated correctly!
M
Me
Excellent purchase

I have been using this Bluelab PH Pen since December 2023 and it is still working great, I dip it in clean water after every each use keep the tip wet so it doesn't dry out.
I feel comfortable knowing the readings are true and my hydroponics are thriving.

Me review photo
B
Bigfysh93
Game changer

This meter was a game changer for me, took a lot of stresses away since I live and die by accurate ph readings for growing them trees! High quality piece here that I (beyond) highly recommend this product! Easy to use on every level.. easy calibration with great directions to get you going. Speed and accuracy…love the fact it tells you when you got it calibrated correctly and also when it needs it again! 10 stars ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️

J
John S.
Great meter and a must have

This ph meter is great! You initially soak in their solution for 24 hours then use their 1 time use 7 and 4 to calibrate. You're not supposed to have to do it again. It comes with power and the only negative I have is that it seems it doesn't need to be recharged which is weird to me. Otherwise, great!

B
Brady R.
Accurate and Robust

My plants love me. That’s all that matters.

e
eldon r.r.
Looking to get another one for E.C's readings

Love it best digital meter I've ever purchased.

s
steven r.
Very happy with this

This meter has worked great ever since i bought it. I haven't had any issues with it.

M
Matt
Best on the market

Bluelabs are always the most consistent and accurate. Easy to use with quick readings.

G
Grandpa's G.
Super Reliable & Accurate!

Most reliable and accurate PH meter on the market. Super easy to use and calibrate. I wouldn't have anything else in my greenhouse.

R
Raymond
Blue lab accurate

Love my blue lab have used for years easy calibration and accurate. Buy the calibration and storage solution to maintain this product and have great long term use. The led screen is easy to read and displays water temperature. Functions fantastic

S
SL
MUST GEETTTT

It delivers fast, accurate pH and temperature readings—crucial for healthy plants, especially in hydroponics. The pen is well-built, waterproof, and easy to use, with a clear digital display.

What sets this kit apart is the included Probe Care Kit. It comes with calibration solutions, storage solution, and a cleaning brush—everything needed to keep the pen accurate and long-lasting. Since I started regular calibration and cleaning, my readings have stayed rock-solid.

h
heather
I'm done buying the cheap ones!

Best most accurate ph pen I've owned. Just wish it read to one more decimal place.