The Bluelab Replacement pH Probe is a high‑precision, laboratory‑grade sensor designed to restore the accuracy and performance of your Bluelab pH meters and controllers. Whether your original probe has aged, become damaged, or is no longer holding calibration, this replacement probe ensures your system continues delivering reliable, fast, and consistent pH readings — essential for healthy plant growth in hydroponics, coco, and soil‑based environments.

Built with a high‑quality glass bulb, double‑junction reference, and durable waterproof housing, the Bluelab pH Probe is engineered for long‑term use in demanding grow‑room conditions. It connects easily to compatible Bluelab devices, including the Bluelab pH Controller, Bluelab Guardian Monitor, Bluelab Combo Meter, and Bluelab pH Meter.

Accurate pH monitoring is crucial for nutrient uptake and root health. This replacement probe ensures your readings remain trustworthy, helping you prevent nutrient lockout, deficiencies, and slow growth.

Key Features & Benefits

Laboratory‑Grade Accuracy

Delivers fast, stable, and precise pH readings for professional‑level nutrient management.

Fully Waterproof Design

Built to withstand constant use in reservoirs, tanks, and grow environments.

Easy Replacement & Compatibility

Fits a wide range of Bluelab devices, making probe replacement quick and hassle‑free.

Double‑Junction Probe

Improves lifespan and reliability, especially in nutrient‑rich solutions.

Fast Calibration

Simple one‑ or two‑point calibration keeps your readings accurate with minimal effort.

Ideal for All Growing Systems

Perfect for hydroponics, coco, soil, DWC, RDWC, NFT, and run‑to‑waste setups.

Easy to Clean & Maintain

Designed for long‑term performance with proper care using Bluelab cleaning solutions.