Description
Milwaukee Industrial-Grade Double Junction pH Electrode w/ Extended Cable
When you’re running a planted tank with CO₂—or any setup where pH stability matters—your probe is the make-or-break component. The Milwaukee MA911B/2 is a lab-grade, gel-filled pH electrode built for consistent readings and longer service life, especially in real-world aquarium conditions where probes can drift, foul, or clog over time.
Product Overview
A pH controller can only be as accurate as the electrode feeding it data. This probe is designed to help you maintain dependable pH readings so your controller can make smarter decisions about CO₂ dosing—supporting healthier plant growth, steadier livestock conditions, and fewer “mystery swings.”
Key Features:
Here’s what makes the MA911B/2 a strong upgrade or replacement probe for aquarium monitoring and automation:
- Double-junction design: Helps reduce contamination and lowers the risk of junction clogging—one of the most common reasons probes fail early.
- Spherical glass tip: Provides a larger effective surface area for faster response and more consistent readings.
- Durable resin body: Built to handle bumps and knocks while protecting the sensing bulb; well-suited for demanding use.
- Extended cable reach: 2 m / 6.6 ft cable gives you more flexibility in where you mount your controller or monitor.
- BNC connection (common Milwaukee standard): Simple plug-in replacement for compatible Milwaukee monitors/controllers.
Together, these features help keep readings steadier and maintenance headaches lower—exactly what you want when your setup depends on reliable pH feedback.
Compatibility Information
This electrode is designed for Milwaukee monitors and controllers and is a known match for Milwaukee controller lines that use a BNC pH probe input (for example, the MC122 pH Controller is commonly supplied with the MA911B/2 probe).
At Modern Aquarium, this probe is a compatible with or replacement/upgrade for:
How to Use & Specs
pH meters usually start performing poorly because the probe needs maintenance.
- Storage: the probe must stay hydrated. Long periods of dry storage can permanently reduce sensitivity and contribute to junction problems. Store the tip in proper pH storage solution (or appropriate calibration buffer), not tap water or DI/RO water. A simple best practice is to keep the cap filled with storage solution and store the electrode upright to reduce leakage.
- Cleaning: Residue and biofilm can coat the sensing bulb and clog the junction over time—especially in aquariums with organics. Periodic soaking in a dedicated electrode cleaning solution helps restore responsiveness.
- Calibration: Calibrate regularly at recommended intervals—especially after cleaning or long storage—to keep your controller/monitor accurate.
Why Buy from Modern Aquarium
The Milwaukee MA911B/2 Industrial-Grade Double Junction pH Electrode offered by Modern Aquarium is selected for aquarists who want dependable pH monitoring—especially in CO₂-injected planted tanks where controller accuracy matters. Whether you’re replacing a worn probe or upgrading for more stable readings, this is a proven, lab-grade electrode designed to work seamlessly with Milwaukee-based monitoring and automation setups.
- Top Quality Store: Modern Aquarium has been trusted by and has thousands of individual verified reviews from real customers, so you can shop with confidence.
- Fast, Reliable Shipping: We process orders carefully and ship promptly with tracking so you know exactly when your equipment is on the way and when it’s arriving.
- Compatibility You Can Trust: This electrode is a compatible replacement/upgrade for Modern Aquarium CO₂ and monitoring setups including the Fully Automated CO2 System with PH & CO2 Controller, Milwaukee PRO pH & CO2 Controller, and Milwaukee pH Monitor with Alarm, helping you keep your system running accurately and consistently.
- Genuine, Purpose-Built Equipment: We focus on quality gear that’s actually used in planted aquarium environments—so you’re not guessing whether a probe is appropriate for continuous monitoring and controller-based dosing.
Complete your CO₂ setup by pairing this electrode with a calibrated pH monitoring solution, and a reliable CO₂ delivery system so your planted tank stays stable, healthy, and thriving.
