Bluelab pH Pen

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.

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.