Ideal for effortless pH and temperature readings directly from your solution, the Bluelab pH Pen offers a compact and convenient tool to monitor and optimize crop performance. Ensuring proper pH levels—whether your solution is acidic or alkaline—is crucial for nutrient uptake and overall plant health. Paired with the Bluelab Conductivity Pen, this creates a reliable, accurate, and easy-to-use system for managing your crops effectively. https://youtu.be/Mvaa4Jrl0MU Easy to use: Handheld design is compact & convenient. Backlit display is bright & easy to read. Accurate & reliable: Double-junction probe & simple, 2-point pH calibration with a 30-day reminder. Read temperature in °C or °F. Built for growers: Designed for everyday use, the Bluelab pH Pen is waterproof & floats in any solution. Product Features: 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