Milwaukee pH/EC/Temperature Monitor for swimming pools

The pH/EC/Temp Monitor lets you monitor your pH/EC/Temp levels 24/7 automatically.

The MC811 MAX Monitor automatically monitors and displays pH/EC/Temp levels. Just calibrate the parameters and let the Milwaukee MAX Monitor do the rest.

Product Overview and Reviews

The Milwaukee MC811 MAX Monitor has been cited in hydroponics and aquaculture publications for providing reliable, continuous monitoring of nutrient and pH levels. Independent lab tests confirm its pH accuracy of ±0.2 and EC accuracy of ±2% Full Scale. Customer feedback highlights ease of installation, low maintenance, and robust performance, with most users applying it to hydroponic systems, aquariums, and nutrient tanks. Professionals in horticulture and aquaculture note its usefulness in maintaining stable environmental conditions for plant growth and aquatic life. The Milwaukee MC811 MAX pH/EC/Temp Monitor is preferred by people looking to know 24/7 what their pH and nutrient levels are on an ongoing basis. Common uses are nutrient tanks, hydroponics, and aquariums. The Milwaukee MAX pH/EC/Temp Monitor offers:

ACCURACY

The Milwaukee MAX Monitor provides an accuracy of ±0.2 pH with two-point manual calibration, EC accuracy of ±2% Full Scale, and ±0.5 °F (0.3 °C) temperature accuracy.

AUTOMATION

Just calibrate the parameters and begin to monitor 24/7 automatically.

EASY INSTALLATION

The MC811 MAX pH/EC/Temp Monitor comes with a complete mounting kit, including a probe holder for straightforward setup.

DESIGN FEATURES

• Fast, easy-to-read results with three large digital backlit LCD readouts.
• Accurate to ±0.2 pH (range 0.0 to 12.0 pH).
• Accurate ±2% Full Scale EC measurement.
• External switch atop the unit converts EC conductivity using 0.5 or 0.7 conversion factors.
• Simple two-point pH calibration and one-point EC calibration with manual trimmers for easy adjustment.
• Gel-filled, double-junction MA911B/2 lab-grade pH electrode for low maintenance and high performance.
• 6.5-foot probe cables for flexible placement.
• 12 VDC power supply included.

pH/EC/Temp Monitor Specifications

• pH Range: 0.0 - 12.0 pH
• pH Resolution: 0.1 pH
• pH Accuracy: ±0.2 pH
• pH Calibration: Manual, 2 points (trimmer)
• pH Probe: MA911B/2 (included)
• EC Range: 0.00 - 5.00 mS/cm
• EC Resolution: 0.01 mS/cm
• EC Accuracy: ±2% Full Scale
• EC Calibration: Manual, 1 point (trimmer)
• EC Probe: MA812 (fixed, included)
• Temperature Range: 14.0 to 140.0°F (-10.0 to 60.0°C)
• Temperature Resolution: 0.1°F / 0.1°C
• Temperature Accuracy: ±0.5°F / ±0.3°C
• Temperature Calibration: Factory calibrated
• Temperature Compensation: Automatic, 41 to 122°F (5 to 50°C) (TDS / EC readings only)
• Temperature Probe: Stainless steel (fixed, included)
• Power Supply: 12 VDC adapter (included)
• Dimensions: 6.3" x 4.3" x 1.4" (160 mm x 110 mm x 35 mm)
• Weight: 1.2 lbs. (560 g)

USE AND CARE

pH meters usually start performing poorly because of problems with the probe. The two parts of the pH probe that cause problems are the glass sensing bulb and the reference junction.

SENSING BULB

The glass bulb loses sensitivity with use and will eventually fail. This is true of all pH probes.

REFERENCE JUNCTION

The reference junction is a small hole that allows the meter to compare the sample to a reference. The reading is generated based on the electrical difference between the sample and reference. If the junction hole gets clogged, the pH probe will no longer function. You can extend the life of your pH electrode in the following ways.

STORAGE

The pH probe needs to be kept hydrated. Long periods of dry storage will damage the sensitivity of the probe. Allowing the probe to dry out may also result in the junction hole getting clogged. Storing in pH probe storage solution or calibration buffers will help address both issues. Do not store in tap water or DI water, as this will damage the probe’s sensitivity. The best way to store the probe is with the probe's cap filled with storage solution or calibration buffer, tightened to prevent leakage. Storing the electrode upright is also recommended.

CLEANING

Residue from the sample can impact the sensitivity of the sensing bulb and clog the junction. This is especially true if the sample has a lot of organic material. Regularly soaking your electrode in cleaning solution is recommended.

CALIBRATION

The pH sensing bulbs become less sensitive over time, so make sure to calibrate regularly to maintain accuracy. Also, calibrate after cleaning or after long periods of storage.

Q&A

How often should I calibrate the Milwaukee MC811 MAX?

Regular calibration is recommended at least once a week or after cleaning or long storage periods to maintain accurate readings.

Can I use this monitor in both hydroponics and aquariums?

Yes, the MC811 MAX is suitable for hydroponics, aquariums, and nutrient tanks where continuous pH, EC, and temperature monitoring is needed.

What is included with the MC811 MAX monitor?

The package includes the MC811 MAX unit, MA911B/2 pH probe, MA812 EC probe, stainless steel temperature probe, mounting kit, and 12 VDC power supply.

What is the lifespan of the pH probe?

With proper care—hydrated storage, regular cleaning, and calibration—the pH probe can last several years, though the glass bulb may eventually require replacement.