Digital pH / ORP Controller for water
- Range: range: 0.00 to 14.00 ph |orp: ±1000 mv
- Resolution: 0.1 ph, 1 mv
- Accuracy: ±0.2 ph | ±5 mv
- Calibration: manual 2 point ph only | orp factory calibrated
The Digital pH / ORP Controller Milwaukee MC125 PRO is designed for people looking to measure and adjust pH and ORP levels automatically with one simple controller.
The Milwaukee MC125 PRO is widely recognized in hydroponics, aquaculture, and water treatment industries for its reliable dual pH and ORP monitoring. Peer-reviewed studies and industry articles highlight its precision and stability in maintaining water chemistry for plant nutrient solutions and aquatic life. Customer reviews consistently praise its ease of use, consistent accuracy, and suitability for both hobbyist and professional setups, making it a popular choice for nutrient tanks, aquariums, pools, and spas.
Just set your pH and ORP parameters and let the Milwaukee pH controller do the rest.
The Milwaukee PRO pH / ORP controller is preferred by people looking to dial in their testing program when they have an ongoing need to maintain levels. Common uses are nutrient tanks, aquariums, pools, and spas.
The Milwaukee PRO pH / ORP controller offers:
ACCURACY
The Milwaukee PRO 2 in 1 controller offers an accuracy of ±0.2 pH with two-point manual calibration and ORP accuracy to ±5 mV.
REAL-TIME MONITORING
See real-time pH and ORP measurements from 0.00 pH to 14.00 pH and -1000 mV to 1000 mV with a large LED display and easy switching between parameters.
AUTOMATION FOR CONSTANT MEASUREMENT
The controller provides a control range of 4 to 8 pH and -200 to 600 mV. Just set your control range and the controller does the rest.
TWO DEDICATED RELAYS FOR PH AND ORP CONTROL TO SUPPORT A RANGE OF COMPATIBLE DEVICES
Choose your device including oxygen pumps, CO2 regulators, O3 ozonizers, and other pH & ORP control devices by simply plugging the device into the correct pH or ORP outlet.
EASY INSTALLATION
- The controller comes with a complete mounting kit including two probe holders.
- Fast, easy-to-read current results with large digital LCD readout.
- Accurate to ±0.2 pH and ±5 mV with user-selectable high/low set points.
- Simple two-point calibration for increased pH accuracy with manual trimmers for easy adjustment.
- Lab-grade, gel-filled, double-junction pH electrode and platinum ORP electrode included for low maintenance and high performance.
- 6.5 feet probe cables for extra flexibility when testing.
- 12 VDC power supply.
CARE AND USE
Properly maintaining your pH and ORP probes will give you fast, accurate results for longer. pH and ORP probes are similar in design, but there are some differences.
pH probes have a sensing bulb that loses sensitivity with age. All pH sensors have a limited life, and response time increases over time.
ORP probes usually have a platinum electrode instead of a glass bulb. This electrode has a longer life but can develop residue buildup affecting response rates and accuracy.
Both electrodes have a reference junction that can become clogged, resulting in slow or inaccurate results. Cleaning and keeping the probe hydrated will help prevent this.
pH Probe
Top tips for maintaining your pH probe:
- Always store with the cap full of buffer or storage solution, not water.
- Clean your probe regularly by soaking in a cleaning solution.
- Calibrate after cleaning and/or storage before testing to adjust for changes in the pH sensor.
- Gently stir the probe in the sample for a faster result.
ORP Probe
Top tips for maintaining your ORP probe:
- Always store with the cap full of buffer or storage solution, not water.
- Clean your probe regularly by soaking in a cleaning solution.
- Calibrate after cleaning and/or storage before testing to adjust for changes in the ORP sensor.
Q&A
Can the Milwaukee MC125 PRO be used in saltwater aquariums?
Yes, it can accurately monitor and control pH and ORP in saltwater aquariums, provided the electrodes are properly maintained and calibrated for the environment.
How often should I calibrate the pH and ORP probes?
It is recommended to calibrate the probes after each cleaning or storage period, or at least once a week in high-usage setups.
What devices are compatible with the controller relays?
The dedicated relays can operate CO2 regulators, oxygen pumps, ozonizers, and other pH or ORP control devices that match the controller's voltage specifications.
What is the expected lifespan of the pH and ORP electrodes?
pH electrodes typically last 6–12 months depending on usage, while ORP electrodes can last up to 2 years with proper care.
Is the Milwaukee MC125 PRO suitable for professional hydroponic setups?
Yes, it is widely used in professional hydroponics due to its high accuracy, dual control, and ability to automate chemical dosing systems.
- pH Range: 0.00 - 14.00 pH
- ORP Range: ± 1000mV
- pH Resolution: 0.01 pH
- ORP Resolution: ± 1 mV
- pH Accuracy: ± 0.2 pH
- ORP Accuracy: ± 5 mV
- Set point pH: 4 to 8 pH
- Set point ORP: -200 to 600 mV
- Calibration: Manual 2 points pH | OPR Factory calibrated
- Alarm Active when reading is higher or lower than set point
- pH Dosing Contact
- 1 power plug for CO2 dosing
- ORP Dosing Contact
- 1 power plug for O3 dosing
- pH Electrode: MA911B/2 (included)
- ORP Electrode: MA921B/2 (included)
- Environment: 0 to 50°C / 32 to 122°F; max RH 95%
- Power Supply: 12 VDC adapter (included)
- Power Drivers: 115 VAC, 2A, 60Hz or 230 VAC, 1A, 50Hz
- Dimensions: 5.8 x 3.25 x 1.26 inches
- Weight: 7.1 ounces
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