Milwaukee MW101 PRO pH Meter – Reliable Precision in the Palm of Your Hand

When accuracy matters – whether you’re balancing nutrients in a hydroponic system, checking water quality in an aquarium, or crafting the perfect brew – the Milwaukee MW101 PRO pH Meter delivers. Built for those who demand lab-grade results in the field or at the bench, this rugged, portable meter combines fast response, high accuracy, and long-lasting reliability in one professional tool.

From growers to aquarists, educators to food producers, the MW101 PRO empowers you to take control of your pH measurements with confidence. Designed for quick setup, straightforward calibration, and day-in-day-out use, it’s a trusted companion for professionals and enthusiasts alike who need precision without complexity.

Engineered for Hands-On Accuracy

The MW101 PRO isn’t just another handheld meter – it’s your reliable partner for essential water testing. Whether you're adjusting nutrient solutions, monitoring fermentation, or checking pool water, the MW101 PRO helps you make quick, informed decisions that protect your results and your peace of mind.

Featuring a durable casing, easy-to-read LCD, and a high-quality MA911B/1 double-junction pH electrode, this meter is built for performance in the real world. Manual two-point calibration allows for precise adjustment, giving you better control over measurement accuracy than auto-calibrated models.

Take it anywhere. Use it anytime. Depend on it always.

Why Choose the Milwaukee MW101 PRO?

• High Accuracy: Achieve professional-grade results with ±0.02 pH accuracy – ideal for applications where precision is non-negotiable.
• Quick Response: Fast, stable readings let you act quickly and confidently, whether in the lab, field, or on-site.
• Robust and Portable: Built to last with a durable, water-resistant body – perfect for rugged environments.
• Simple Calibration: Two-point manual calibration with included calibration solutions ensures accuracy you can trust.
• Lab-Grade Electrode: Includes the MA911B/1 gel-filled, double-junction pH electrode for longer life and better performance in harsh samples.
• Made for Professionals: Trusted by growers, brewers, aquarists, educators, and industry operators across the globe.

Applications

Hydroponics & Agriculture

For hydroponic systems and soil-based agriculture, pH monitoring is essential for nutrient availability and plant health. The MW101 PRO's accuracy aids growers in optimizing nutrient uptake and maximizing crop yields.

Swimming Pools & Aquariums

Maintaining proper pH levels in pools and aquariums is vital for the health of swimmers and aquatic life. The MW101 PRO offers reliable measurements to ensure safe and balanced water conditions.

Brewing & Winemaking

In brewing and winemaking, maintaining optimal pH levels is crucial for fermentation control and product quality. The MW101 PRO provides precise readings, ensuring consistency in taste and stability in the final product.

Educational Laboratories

Educational institutions benefit from the MW101 PRO's ease of use and accuracy, making it an excellent tool for teaching pH measurement principles in laboratory settings.

Soil Testing

The MW101-SOIL variant is tailored for direct soil pH measurements, assisting farmers and horticulturists in assessing soil conditions for optimal plant growth.

Beverage Industry

In the production of soft drinks, fruit juices, and other beverages, pH control is essential for flavor and preservation. The MW101-BEV model is designed to meet the specific needs of the beverage industry.

Proper Care & Maintenance

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.

CLEANING AND STORAGE

All pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH pen tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee codes MA9015 and MA9016 at checkout time! This will be needed to help clean and condition the pH electrode before use!

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 MA9015 or pH calibration buffers will help address both these issues. Do not store in tap water and DI water. This will damage the sensitivity of the probe.

The best way to store the probe is with the probe's cap filled with storage solution or calibration buffer and the cap tightened to prevent leakage. It is also recommended that to store the electrode upright to further reduce the potential for leakage.

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. We recommend regularly soaking your electrode in cleaning solution MA9016.

CALIBRATION

The pH sensing bulbs become less sensitive over time so make sure that you are calibrating reguarly to keep your PRO pH meter accurate. Also, calibrate after cleaning or a long period of storage.