Accurate. Simple. Reliable. 24/7 pH Control.

Take control of your pH levels effortlessly with the Milwaukee MC122 PRO pH Controller. Designed for professionals and enthusiasts, this automatic pH controller delivers precise and reliable pH monitoring and adjustment around the clock.

Set your ideal pH range and let the MC122 work for you. With an adjustable control range of 5.5 to 9.5 pH and built-in alarms for readings outside your set points, you’ll achieve optimal conditions for aquariums, nutrient tanks, and hydroponic systems—without constant manual checks.

Users consistently praise the Milwaukee MC122 PRO for its ease of use and long-term reliability:

• “I run this unit 24/7 and have not had any problems for the past two months. It keeps my fish tank CO2 injector running perfectly and puts my mind at ease regarding overdosing.”
• “I’ve been using this controller for two years to monitor and adjust pH of hydroponic nutrient solutions. Still using the original probe and it rarely needs calibration.”
• “Using this as a pH controller for a calcium reactor on a 105 gallon reef tank... I recommend this to any serious reefer.”

Key Features

• Highly accurate to ±0.2 pH with simple manual calibration
• Automated pH adjustment for consistent results
• Settable alarms for out-of-range readings
• Compatible with the Milwaukee MP810 dosing pump
• Fast, easy-to-read digital LCD screen
• Complete mounting kit and probe holder included
• Lab grade, double junction, gel-filled probe for low maintenance
• Long 6.5' probe cable for flexible installation
• Compact size: 5.9 x 3.2 x 1.35 inches. Lightweight at just 6.3 oz.
• 12V DC power supply for reliable operation

Care Instructions

Maintain your MC122 pH controller for consistent performance:

• Always keep the pH probe hydrated in MA9015 storage solution; avoid storing in DI or RO water.
• Store the probe upright and ensure the cap is filled with storage solution and tightly closed.
• Regularly clean the probe in MA9016 cleaning solution to remove residue and prevent clogs.
• Calibrate your controller regularly, especially after cleaning or extended storage, to maintain accuracy.

Choose the Milwaukee MC122 PRO pH Controller for reliable, continuous, and automated pH control—ideal for aquariums, hydroponics, and nutrient dosing systems. Experience stress-free monitoring with trusted precision and performance.