Product Description
Bluelab pH Pen – Waterproof Handheld pH & Temperature Meter
The go-to pH pen for growers worldwide. The Bluelab pH Pen is a compact, hardy, and easy-to-use handheld meter that delivers accurate pH and temperature readings in any nutrient solution. With a double-junction pH probe, 0.1 pH resolution, simple 2-point calibration, and a fully waterproof design that floats — it’s the essential measurement tool for every growing setup, from home hydroponics to commercial greenhouse operations.
Built in New Zealand. Trusted by growers worldwide. One of Bluelab’s top-selling instruments for good reason.
Key Features
Double-Junction pH Probe: Superior contamination resistance for accurate, stable pH readings in nutrient-rich solutions — longer probe life than single-junction designs.
0.1 pH Resolution: Precise readings for confident nutrient management and crop health decisions.
2-Point pH Calibration with 30-Day Reminder: Simple calibration keeps your readings accurate; built-in reminder ensures you never miss a calibration cycle.
Simultaneous pH & Temperature: Reads both parameters at once on a bright, easy-to-read backlit display.
Temperature in °C or °F: Switch between Celsius and Fahrenheit to suit your preference or region.
Waterproof & Floats: Fully waterproof construction that floats in solution — safe for daily use in reservoirs, runoff trays, and water sources.
Compact Handheld Design: Ergonomic, pocket-sized form factor for convenient use anywhere in the grow room or field.
Made in New Zealand: Decades of Bluelab precision instrument manufacturing behind every pH Pen.
Ideal For
Hydroponics & indoor growing nutrient management
Aquaponics & aquaculture water quality monitoring
Greenhouse & commercial growing operations
Cannabis cultivation & precision pH control
Coco coir, NFT, DWC & recirculating systems
Runoff & water source pH testing
Home growers & professional cultivators alike
Technical Specifications
pH Resolution: 0.1 pH
Calibration: 2-point pH calibration with 30-day reminder
Probe: Double-junction pH probe
Temperature: °C or °F
Housing: Waterproof, floats in solution
Display: Backlit LCD
SKU: PENPH
Barcode (UPC): 9421024920234
Country of Origin: New Zealand
Weight: 12 oz
Pro tip: Pair the Bluelab pH Pen with the Bluelab Conductivity Pen for a complete nutrient solution measurement system — covering both pH and EC/PPM in one workflow. Add Bluelab pH 4.0 and 7.0 calibration solution sachets and KCl storage solution for a full maintenance kit.
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.
