Achieve accurate and reliable water quality measurements with the Milwaukee MW101 PRO Professional Digital pH Meter. Designed for demanding water testing applications, this portable instrument combines laboratory-grade measurement accuracy with a rugged, easy-to-use design.

With an impressive accuracy of ±0.02 pH and a resolution of 0.01 pH, the MW101 PRO provides precise pH measurements across a wide range of applications.

Supplied with the professional SE220 double-junction, gel-filled pH electrode, this meter is particularly suitable for aquarium water testing, aquaculture, fish farming, hydroponics, agriculture, brewing and general water quality monitoring.

Its large digital LCD display makes readings easy to interpret, while the manual two-point calibration system helps maintain measurement accuracy.

Whether you're monitoring water conditions in a commercial fish farm, maintaining an aquarium or testing nutrient solutions in hydroponic systems, the Milwaukee MW101 PRO offers dependable performance for regular pH measurement.

Key Features & Benefits

• Professional Measurement Accuracy: Provides ±0.02 pH accuracy at 25°C for precise and dependable measurements.

• High Resolution: Displays measurements to 0.01 pH for more detailed monitoring of water conditions.

• Wide Measurement Range: Measures pH from 0.00 to 14.00, suitable for a wide variety of water testing applications.

• SE220 Professional pH Electrode: Supplied with a double-junction, gel-filled laboratory-grade electrode designed for reliable performance and low maintenance.

• Two-Point Manual Calibration: Allows calibration using offset and slope adjustment trimmers for improved measurement accuracy.

• Manual Temperature Compensation: Adjustable temperature compensation between 0°C and 50°C.

• Large Digital LCD Display: Provides clear, easy-to-read pH measurements.

• Portable & Rugged Design: Compact handheld instrument suitable for laboratory, workshop and field applications.

• Extended Probe Cable: The supplied electrode features an approximately 1-metre cable for convenient sample testing.

• Long Battery Life: Approximately 300 hours of continuous operation from a standard 9V battery.

• Automatic Power-Off: Helps conserve battery life when the instrument is not being used.

Ideal Applications

The Milwaukee MW101 PRO is designed for a wide variety of professional and everyday pH measurement applications.

Aquariums & Fish Tanks

Monitor aquarium water pH to help maintain suitable conditions for freshwater and marine fish. Regular testing helps identify changes in water chemistry and supports effective aquarium management.

Aquaculture & Fish Farming

Monitor pH levels in fish tanks, hatcheries, recirculating aquaculture systems (RAS) and commercial fish farming operations.

Regular pH monitoring is an important part of maintaining stable water quality and supporting healthy aquatic environments.

Koi Ponds & Garden Ponds

Check pond water pH as part of routine water quality management to help maintain suitable conditions for fish and aquatic life.

Hydroponics

Measure nutrient solution pH to help maintain appropriate growing conditions and nutrient availability for plants.

Agriculture & Horticulture

Suitable for measuring pH in irrigation water, nutrient solutions and other agricultural water samples.

Brewing & Food Production

The MW101 PRO is also suitable for applications such as brewing and winemaking where monitoring pH is important for maintaining process consistency.

Water Treatment & Environmental Testing

A practical instrument for monitoring pH in water treatment processes, environmental samples and general water quality applications.

Professional SE220 Double-Junction pH Electrode

The Milwaukee MW101 PRO is supplied with the SE220 professional pH electrode.

This laboratory-grade, double-junction, gel-filled electrode is designed to provide reliable measurements while reducing routine maintenance requirements associated with some refillable electrode designs.

The double-junction construction provides an additional barrier between the reference system and the sample, making it a practical choice for a variety of water testing applications.

Key electrode benefits include:

• Double-junction electrode construction.

• Gel-filled reference electrolyte.

• Low-maintenance design.

• Suitable for general laboratory and water testing applications.

• Approximately 1-metre connection cable.

• Replaceable electrode connected through a BNC connector.

The electrode can be replaced independently if it becomes worn or damaged.

Technical Specifications

Specification	Details
Brand	Milwaukee Instruments
Model	MW101 PRO
Measurement Parameter	pH
Measurement Range	0.00 – 14.00 pH
Resolution	0.01 pH
Accuracy at 25°C	±0.02 pH
Calibration	Manual, 2-point
Calibration Adjustment	Offset and slope trimmers
Temperature Compensation	Manual
Temperature Compensation Range	0°C – 50°C
Electrode	SE220
Electrode Type	Double-junction, gel-filled
Electrode Connection	BNC
Electrode Cable	Approximately 1 metre
Operating Temperature	0°C – 50°C
Maximum Relative Humidity	95%
Battery Type	1 × 9V alkaline
Battery Life	Approximately 300 hours
Display	Digital LCD

Simple Two-Point Calibration

The Milwaukee MW101 PRO features manual two-point calibration using offset and slope adjustment trimmers.

For calibration, suitable pH buffer solutions are used to establish accurate reference points.

Recommended calibration buffers include:

• pH 7.01: Neutral calibration point.

• pH 4.01: Acidic calibration point.

• pH 10.01: Alkaline calibration point.

Two-point calibration helps maintain measurement accuracy across the intended testing range.

For routine aquarium and aquaculture applications, calibration using pH 7.01 and pH 4.01 is a suitable starting point for predominantly neutral to acidic water measurements.

Temperature Compensation

The MW101 PRO features manual temperature compensation between 0°C and 50°C.

Temperature compensation is important because pH electrode response changes with temperature.

Unlike instruments with automatic temperature compensation, the MW101 PRO requires the user to adjust the temperature compensation setting to match the temperature of the sample.

Please note that the MW101 PRO measures pH only and does not provide a digital temperature reading.

Electrode Maintenance & Care

Proper pH electrode maintenance is essential for maintaining measurement accuracy and extending electrode life.

We recommend:

• Keep the electrode hydrated during storage.

• Store the electrode using Milwaukee MA9015 storage solution.

• Never store the electrode in distilled or deionised water.

• Clean the electrode periodically using Milwaukee MA9016 cleaning solution.

• Calibrate regularly and after cleaning or prolonged storage.

• Rinse the electrode between samples to prevent cross-contamination.

• Replace the electrode when response times become excessively slow or measurement performance deteriorates.

Recommended maintenance products include:

• Milwaukee MA9015 Electrode Storage Solution.

• Milwaukee MA9016 Electrode Cleaning Solution.

• Milwaukee MA9007 pH 7.01 Calibration Solution.

• Milwaukee MA9004 pH 4.01 Calibration Solution.

• Milwaukee MA9010 pH 10.01 Calibration Solution.

• Milwaukee SE220 Replacement pH Electrode.

What's Included?

The standard Milwaukee MW101 PRO package includes:

• Milwaukee MW101 PRO digital pH meter.

• SE220 double-junction pH electrode.

• pH 7.01 calibration solution sachet.

• 9V alkaline battery.

• Calibration screwdriver.

• Instruction manual.

• Protective packaging.

Why Buy from GroAqua?

GroAqua supplies specialist water quality monitoring equipment for aquariums, aquaculture, horticulture and water treatment applications.

We understand the importance of accurate and reliable water testing, from maintaining domestic aquariums to managing commercial aquaculture operations.

The Milwaukee MW101 PRO is an excellent choice for customers looking for a professional portable pH meter with high measurement accuracy and a replaceable laboratory-grade electrode.

Order your Milwaukee MW101 PRO Professional Digital pH Meter from GroAqua today.