The ultimate handy solution

for measuring pH and temperature!

Fully waterproof - not just water resistant

Simple two-point calibration process for accuracy

One-year peace-of-mind warranty

Automatic temperature compensation for accurate readings everywhere

Auto-off function to extend battery life

1 AAA battery included - simply power on and go

Why measure pH and temperature?

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.

A compact and robust handheld solution

Everyday accuracy of the fundamentals

This user-friendly and hardy handheld pen will take measurements in increments of 0.1 pH and is fully temperature compensated, so you can expect accurate readings every time.

New Zealand-made quality, built for growers

Our products are designed and built for grower environments - not the lab - so you can relax knowing that your pen can withstand the knocks, drops and deep-water plunges that come with everyday growing. In fact, the fully waterproof Bluelab pH Pen is designed to float when it lands up in your reservoir.

The Bluelab pH Pen was designed and built in New Zealand. Tried and trusted by growers all over the world, this essential tool is one of our top-selling products.