Bluelab PH pen

A hardy, compact pH and temperature pen

Perfect for quick and easy pH and temperature measurements straight from your solution
Completely waterproof - not just water resistant
Simple two-point calibration process for accuracy
One year peace of mind warranty
Automatic temperature compensation for accurate readings anywhere
Auto-off function to extend battery life
1 AAA battery included - just turn on and go

Why measure pH and temperature?

Make sure you get the basics of growing right every time
Healthy growing plants, just like people, need a balanced diet with the right nutrients (nutrition). However, plants can only access these nutrients if the nutrient solution is within a certain pH range.

From a water chemistry perspective, pH (potential hydrogen) plays a vital role in solubilizing the nutrients in your solution so that your plants can access them. That is why if your growing solution becomes too acidic or too alkaline, the plants will not be able to access the nutrients they need to grow. The temperature of your growing solution is just as important as a solution that is too hot or too cold can affect growth rate and structure.

To help your plants thrive, you need to get the basics right by measuring pH and temperature to ensure they are always within the optimal range.

A compact and robust handheld solution

Daily accuracy of the fundamentals
This easy-to-use and robust handheld pen takes measurements in 0.1 pH increments and is fully temperature compensated so you can always expect accurate readings.

New Zealand quality, built for growers

Our products are designed and built for growers - not the lab - so you can relax knowing your pen can withstand the knocks, drops and deep water that come with everyday growing. In fact, the fully waterproof Bluelab pH Pen is designed to float when it lands in your reservoir.
The Bluelab pH pen is designed and built in New Zealand. Tried and trusted by growers around the world, this essential tool is one of our top selling products.