The Growee Double-Injection pH Probe is a high-precision, durable, and easy-to-calibrate sensor designed to provide accurate pH level readings for hydroponic growers. Built with epoxy housing for long-lasting strength, this waterproof probe seamlessly integrates with the Growee Hydro Master and Growee App, ensuring real-time monitoring and precise pH adjustments. Key Features: Accurate pH Measurement – Measures pH range: 4-8 with ±0.1 resolution for precision control.Easy Calibration – Simple two-point calibration with standard pH4 and pH7 solutions.Waterproof & Durable – Epoxy housing ensures long-lasting performance in hydroponic environments.BNC Connector – Provides secure and reliable connectivity.3 ft Cable Length – Offers flexibility for various hydroponic system setups.Made in the USA – High-quality manufacturing for superior performance and reliability.