€217.88

Milwaukee MW804 MAX Waterproof 4-in-1 pH / EC / TDS/Temp Tester with Replaceable Probe

SKU: MW804
Range: pH: 0.00-14.00 pH | EC: 20.00 mS/cm | TDS 0 – 10.00 ppt | Temp: 0.0 to 50.0°C / 32.0 to 122.0°F
Accuracy: pH: ±0.05 pH | EC/TDS: 2% Full scale
CALIBRATION: Automatic
Temperature compensation: Automatic
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Milwaukee MW804 MAX Waterproof 4-in-1 pH/EC/TDS/Temperature Tester with Replaceable Probe

Precision Meets Portability: Your All-in-One Solution for Water Quality Testing

In the dynamic world of water quality management, accuracy, efficiency, and reliability are paramount. Whether you're nurturing delicate hydroponic plants, ensuring optimal conditions in aquaculture, or maintaining pristine water in pools and spas, the Milwaukee MW804 MAX Waterproof 4-in-1 Tester stands as your trusted companion – delivering lab-grade precision in a portable, rugged form.

This advanced multiparameter tester is designed to simplify complex testing routines without compromising on performance. The MW804 MAX brings together four essential measurements – pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature – into one streamlined device, eliminating the need for multiple instruments. From checking nutrient concentrations to monitoring water balance, every reading helps you make informed decisions faster and with greater confidence.

Engineered for both professionals and passionate hobbyists, the MW804 MAX offers fast, stable readings and automatic temperature compensation, ensuring accurate results even under fluctuating conditions. Its intuitive design features a large dual-level LCD, a hold function for easier data recording, and an easy-to-navigate interface that minimizes training time and maximizes usability in the field.

Built to withstand harsh environments, the MW804 MAX features a waterproof IP65-rated body, a replaceable, low-maintenance pH electrode, and long battery life – making it a reliable companion across a wide range of water testing applications. Whether you're in the greenhouse, at the fish farm, or out on-site, this meter is ready to go wherever your work takes you.

With the MW804 MAX in hand, you gain more than just a tool – you gain peace of mind, knowing your water quality is under control with precision you can trust

 

Why Choose the Milwaukee MW804 MAX?

  • Comprehensive Testing: Measure pH (0.00–14.00), EC (up to 20.00 mS/cm), TDS (0–10.00 ppt), and temperature (0.0 to 50.0°C / 32.0 to 122.0°F) with a single device.
  • High Accuracy: Achieve precise readings with ±0.05 pH accuracy, ±2% Full Scale for EC/TDS, and ±0.5°C / ±1°F for temperature.
  • User-Friendly Interface: Features a large dual-level LCD display with stability indicator and hold function for easy data recording.
  • Automatic Temperature Compensation: Ensures accurate readings across varying temperatures.
  • Replaceable Probe: Equipped with a gel-filled, double junction pH electrode for low maintenance and high performance.
  • Durable and Portable: Lightweight at just 3.5 ounces and waterproof to IP65 standards, making it ideal for fieldwork.
  • Long Battery Life: Approximately 100 hours of continuous use with auto shut-off feature to conserve battery.

 

Applications

The versatility of the MW804 MAX makes it suitable for a wide range of applications:

  • Agriculture & Hydroponics: Monitor nutrient solutions and soil conditions to optimize plant growth.
  • Aquariums & Aquaculture: Ensure ideal water conditions for aquatic life by regularly checking pH, EC, TDS, and temperature.
  • Swimming Pools & Spas: Maintain safe and comfortable water by monitoring and adjusting chemical levels.
  • Food & Beverage Production: Test water quality used in production processes to ensure product safety and consistency.
  • Laboratory & Education: Provide accurate measurements for experiments and educational demonstrations.
  • Industrial Applications: Monitor water quality in cooling towers, boilers, and wastewater treatment to prevent scaling and corrosion.
  • Drinking Water & Water Treatment: Verify the quality of potable water and monitor filtration systems.
  • Environmental Monitoring: Assess natural water bodies for pollution levels and support environmental protection initiatives.

 

Proper Care & Maintenance

To ensure the longevity and accuracy of your MW804 MAX:

pH Electrode Maintenance:

  • Always store the pH probe with the cap filled with storage solution (MA9015). Avoid using distilled or deionized water for storage.
  • Regularly clean and condition the pH electrode using Milwaukee Maintenance Solutions MA9015 & MA9016.

EC Sensor Care:

  • Rinse the probe with distilled water after each use to prevent residue buildup.
  • Calibrate regularly using appropriate calibration solutions to maintain measurement accuracy.

General Tips:

  • Avoid immersing the tester beyond the maximum immersion level indicated on the device.
  • Replace batteries when the low battery indicator appears to ensure reliable operation.

Order the Milwaukee MW804 MAX Today!

Whether you're managing hydroponic systems, caring for aquatic life, maintaining crystal-clear pool water, or testing in the field or lab, the Milwaukee MW804 MAX 4-in-1 Tester has you covered. With fast, accurate readings of pH, EC, TDS, and temperature, it’s your all-in-one solution for water quality monitoring.
Reliable. Rugged. Ready. Invest in professional-grade results – order your MW804 MAX today!



Specifications


pH Range: 0.00 to 14.00 pH
EC Range: 20.00 mS/cm
TDS Range: 0 to 10.00 ppt
Temp Range: 0.0 to 50.0°C / 32.0 to 122.0°F
pH Resolution: 0.01 pH
EC Resolution: 0.01 mS/cm
TDS Resolution: 0.01 ppt
Temp Resolution: 0.1 C / 0.1 F
pH Accuracy: ±0.05 pH
EC/TSD Accuracy: 2% Full scale
Temp Accuracy: ±0.5°C / ±1°F
Temperature Compensation: Automatic with ß=0.0 to 2.4%/°C
Calibration automatic, 1 point for EC and 1 or 2 points for pH
TDS Factor: 0.45 to 1.00 (conv.)
Probe: Mi60P (replaceable)
Environment: 0 to 50°C; 100% RH max.
Battery Type: 4 x 1.5V; IEC LR44, A76 (included)
Battery Life: approx. 100 hours of use
Auto-off after 8 minutes of non-use
Dimensions: 7.9 inches × 1.5 inches (diameter)
Weight: 3.5 ounces

Application

Agriculture & Hydroponics

Monitor nutrient solutions and soil conditions to optimize plant growth.

In both traditional agriculture and hydroponic systems, maintaining the correct balance of pH, EC, TDS, and temperature is critical to ensuring healthy plant development and maximizing yields. The Milwaukee MW804 MAX allows growers to precisely monitor nutrient concentrations, helping to prevent deficiencies or toxicities that can stunt growth or harm crops. Regular testing of irrigation water and fertigation solutions ensures that plants receive nutrients in the most bioavailable form. In hydroponics, where water is the main delivery system, controlling EC and pH is especially crucial for maintaining ideal root zone conditions. With its fast, accurate readings and portable design, the MW804 MAX empowers growers to fine-tune their nutrient programs and respond quickly to any fluctuations, resulting in healthier plants, better harvests, and more efficient resource use.

How to Use the MW804 MAX in Agriculture & Hydroponics

  1. Prepare the Solution or Sample
    For hydroponics, collect a sample of your nutrient solution in a clean container. For soil-based agriculture, extract a soil slurry using distilled water (typically a 1:2 ratio of soil to water) and stir well before measurement.
  2. Turn On the MW804 MAX
    Press the power button to activate the tester. Make sure the protective cap is removed and the electrode is clean.
  3. Submerge the Electrode
    Place the electrode into the solution, ensuring that the sensor is fully submerged. Gently stir the meter to eliminate air bubbles and stabilize the reading.
  4. Read the Values
    The MW804 MAX will simultaneously display readings for:

·       pH – to assess the acidity/alkalinity of your nutrient mix or soil solution.

·       EC (Electrical Conductivity) – to measure overall nutrient concentration.

·       TDS (Total Dissolved Solids) – for estimating the total nutrient load in ppm.

·       Temperature – to ensure your nutrient solution is within optimal thermal ranges.

  1. Record and Act
    Use the readings to adjust your nutrient mix or pH levels as needed. This helps avoid overfeeding, nutrient lockout, or suboptimal root conditions.
  2. Rinse and Store Properly
    After use, rinse the electrode with distilled water to remove residue. Replace the protective cap with proper storage solution to maintain sensor longevity.
  3. Calibrate Regularly
    For the most accurate results, calibrate your MW804 MAX routinely using standard calibration solutions, especially before high-stakes measurements.

 

Aquariums & Aquaculture

Maintaining water quality is crucial for the health and vitality of fish, corals, and other aquatic organisms. In both home aquariums and commercial aquaculture operations, fluctuations in pH, nutrient levels, or temperature can cause stress, disease, or even loss of stock. The Milwaukee MW804 MAX offers a reliable, all-in-one solution to keep your aquatic environments stable and thriving.

By measuring pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature, this waterproof tester allows aquarists and fish farmers to monitor the delicate balance of their water systems. Accurate readings help you:

  • Ensure optimal biological functions like respiration and digestion.
  • Prevent harmful ammonia spikes or mineral imbalances.
  • Tailor feeding and water treatment strategies.
  • Adjust filtration or aeration systems based on real-time water parameters.

Whether you're raising ornamental fish, breeding koi, managing a hatchery, or maintaining a reef tank, the MW804 MAX helps safeguard your aquatic ecosystem.

How to Use the MW804 MAX in Aquariums & Aquaculture

  1. Collect the Water Sample (Optional)
    For smaller aquariums, you can measure directly in the tank. For larger systems or multiple tanks, use a clean container to collect a water sample.
  2. Power On the Tester
    Press the power button to activate the MW804 MAX. Remove the protective cap and ensure the sensor is clean and properly hydrated.
  3. Insert the Electrode into the Water
    Submerge the electrode in the tank or sample container. Stir gently to eliminate trapped air bubbles and allow the sensor to stabilize.
  4. Monitor the Readings
    The display will show:

·       pH: Helps assess biological compatibility and buffering capacity.

·       EC: Indicates ion concentration, important in marine tanks and aquaculture systems.

·       TDS: Provides insight into dissolved substances that affect water clarity and quality.

·       Temperature: Ensures thermal comfort and metabolic efficiency for aquatic life.

  1. Adjust as Needed
    Use the readings to:

·       Regulate pH with buffers or water changes.

·       Modify salinity or mineral levels.

·       Optimize tank conditions for breeding, feeding, or treatment.

  1. Rinse and Store the Tester
    After testing, rinse the electrode with distilled or RO water. Refill the cap with storage solution and secure it to maintain electrode performance.
  2. Calibrate Regularly
    For the best accuracy, calibrate the MW804 MAX routinely using standard solutions, especially if you test frequently or use the device in saltwater environments.

 

Swimming Pools & Spas

Keeping pool and spa water clean, safe, and comfortable is essential for health and enjoyment. Improper chemical balance can lead to skin irritation, corrosion of pool equipment, cloudy water, or the growth of harmful bacteria and algae. The Milwaukee MW804 MAX offers a simple yet precise way to monitor critical water parameters such as pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature all in one device.

  • pH levels influence the effectiveness of chlorine and other sanitizers—too low can cause corrosion, while too high can lead to scaling and reduced sanitizer efficiency.
  • EC and TDS measurements help detect total mineral content, salts, and dissolved chemicals that accumulate over time, indicating when water needs dilution or treatment.
  • Temperature affects chemical reaction rates and swimmer comfort, making it important to monitor regularly.

By using the MW804 MAX, pool operators and spa owners can maintain ideal water chemistry, ensuring sparkling clear water, extended equipment life, and a safe swimming environment for family, guests, or customers.

 How to Use the MW804 MAX in Swimming Pools & Spas

  1. Prepare for Testing
    Remove the protective cap and rinse the electrode with clean water to avoid contamination.
  2. Power On the Device
    Press the power button to activate the tester.
  3. Sample Collection
    For accurate results, collect water from about 18 inches below the surface in a clean container or directly dip the electrode into the pool or spa water.
  4. Insert the Electrode
    Submerge the electrode in the water sample or pool/spa. Stir gently to ensure the sensor is fully immersed and free of bubbles.
  5. Read the Measurements
    Wait for the readings to stabilize. The MW804 MAX will display:

·       pH: Critical for chemical balance and sanitizer efficiency.

·       EC: Indicates the overall salt and mineral concentration.

·       TDS: Measures dissolved solids, helping detect buildup or contamination.

·       Temperature: Impacts chemical behavior and user comfort.

  1. Interpret and Adjust

·       If pH is outside the ideal range (usually 7.2–7.8), adjust with pH increasers or decreasers.

·       High EC or TDS may mean it’s time for partial water replacement.

·       Temperature readings can guide heating system settings.

  1. Post-Use Care
    Rinse the electrode with fresh water after each test to prevent residue buildup. Store the device with the protective cap filled with storage solution to maintain sensor accuracy and longevity.
  2. Regular Calibration
    Calibrate the tester regularly with standard buffer solutions to ensure ongoing precision, especially during heavy pool/spa usage periods.

 

Food & Beverage Production

Water quality is a critical factor in food and beverage production, impacting product safety, taste, and consistency. Contaminated or imbalanced water can introduce unwanted flavors, affect fermentation, reduce shelf life, or even pose health risks. The Milwaukee MW804 MAX allows producers to precisely monitor key water parameters – pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature – ensuring that water used in every stage of production meets strict quality standards.

  • pH monitoring helps maintain the correct acidity or alkalinity, crucial for processes like brewing, dairy production, and bottling.
  • EC and TDS measurements detect dissolved salts and minerals that could influence taste or chemical reactions.
  • Temperature control is essential for consistency in mixing, pasteurization, and fermentation processes.

By using the MW804 MAX, food and beverage manufacturers can safeguard product integrity, optimize processes, and comply with regulatory standards, contributing to higher quality products and customer satisfaction.

How to Use the MW804 MAX in Food & Beverage Production

  1. Prepare the Device
    Rinse the electrode with distilled water before use to avoid contamination and ensure accurate readings.
  2. Power On
    Turn on the MW804 MAX by pressing the power button.
  3. Collect Water Sample
    Use a clean, food-grade container to collect a representative sample from the water source or production line.
  4. Measure the Parameters
    Submerge the electrode in the sample. Stir gently to eliminate air bubbles and ensure consistent contact with the water.
  5. Record the Readings
    Wait for the readings to stabilize on the display:

·       pH: To verify proper acidity or alkalinity levels.

·       EC: To monitor mineral and salt concentration.

·       TDS: To detect total dissolved solids affecting flavor or safety.

·       Temperature: To ensure process conditions are met.

  1. Analyze & Adjust
    Use the measurements to adjust water treatment processes, ingredient formulations, or production parameters as needed to maintain product quality.
  2. Clean & Store
    Rinse the electrode thoroughly with distilled water after each test. Store the device with the protective cap filled with storage solution to keep the sensors hydrated and calibrated.
  3. Regular Calibration
    Periodically calibrate the tester using standard buffer solutions and conductivity standards to maintain accuracy, especially during frequent testing.

 

 Laboratory & Education

In laboratory settings and educational environments, precision and reliability are essential for successful experiments and clear demonstrations. The Milwaukee MW804 MAX offers accurate, multi-parameter water testing – measuring pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature – all in one portable device. This makes it an ideal tool for students, teachers, and researchers to analyze water quality efficiently and with confidence.

Whether used for chemistry experiments, biology projects, or environmental science studies, the MW804 MAX helps users understand fundamental concepts such as acidity, ionic content, and thermal effects in liquids. Its easy-to-read display and waterproof design also make it practical for hands-on learning in classrooms, labs, and fieldwork.

By providing real-time data, the MW804 MAX encourages active learning, fosters curiosity, and supports accurate scientific reporting.

How to Use the MW804 MAX in Laboratory & Educational Settings

  1. Prepare the Device
    Ensure the electrode is clean and rinsed with distilled water before each use to prevent cross-contamination between samples.
  2. Turn On the Tester
    Press the power button to activate the MW804 MAX.
  3. Sample Collection
    Collect a small volume of the liquid sample in a clean beaker or test tube.
  4. Immersion and Measurement
    Gently immerse the electrode into the sample, making sure it is fully submerged. Stir slowly to remove any trapped air bubbles around the sensor.
  5. Read and Record
    Wait for the readings to stabilize on the digital display. Record the values for pH, EC, TDS, and temperature to analyze your experiment or demonstration.
  6. Repeat if Needed
    For comparative studies or multiple samples, rinse the electrode with distilled water between tests to ensure accuracy.
  7. Calibration and Maintenance
    Regularly calibrate the tester using appropriate buffer and conductivity standards to maintain accuracy. Store the electrode in the provided storage solution when not in use to preserve sensor life.
  8. Data Analysis and Discussion
    Use the collected data to explain chemical reactions, water quality concepts, or other scientific phenomena, helping students connect theory with practical results.

 

Industrial Applications

In industrial environments, maintaining optimal water quality is critical to the efficiency, safety, and longevity of equipment. The Milwaukee MW804 MAX is designed to monitor key water parameters – pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature – helping to prevent costly issues such as scaling, corrosion, and microbial growth in cooling towers, boilers, and wastewater treatment systems.

By regularly testing water in these systems, operators can ensure the water chemistry remains within recommended levels, reducing downtime and maintenance costs. The MW804 MAX’s robust, waterproof design withstands harsh industrial conditions, while its multi-parameter functionality provides comprehensive data for informed decision-making. This contributes to improved process control, energy efficiency, and regulatory compliance.

 How to Use the MW804 MAX in Industrial Settings

  1. Prepare the Device
    Before testing, make sure the electrode is clean. Rinse it with distilled water to remove any residues from previous measurements.
  2. Power On the Tester
    Press the power button to turn on the MW804 MAX.
  3. Sample Collection
    Collect a water sample from the system—such as from a cooling tower basin, boiler feed water, or wastewater stream—in a clean container.
  4. Immersion and Testing
    Submerge the electrode into the sample. Ensure the sensor is fully immersed and stir gently to eliminate air bubbles that may affect readings.
  5. Read the Results
    Wait until the readings stabilize on the display. Record the pH, EC, TDS, and temperature values for analysis.
  6. Routine Monitoring
    Perform tests regularly to track changes in water quality over time. Use the data to adjust chemical treatments and operational parameters as needed.
  7. Calibration and Maintenance
    Calibrate the MW804 MAX routinely using manufacturer-recommended standards to maintain precision. After use, clean and store the electrode properly to extend its lifespan.

 

Drinking Water & Water Treatment

Ensuring the safety and quality of drinking water is a top priority for public health and regulatory compliance. The Milwaukee MW804 MAX helps verify that potable water meets stringent quality standards by accurately measuring pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature. These parameters are essential for detecting contamination, assessing the effectiveness of filtration and purification systems, and maintaining balanced water chemistry.

Whether used by municipal water treatment facilities, private well owners, or water filtration system installers, the MW804 MAX provides reliable, real-time data to prevent potential health risks. Its waterproof design and multi-parameter functionality make it ideal for both field testing and routine maintenance of treatment processes.

 How to Use the MW804 MAX for Drinking Water & Treatment

  1. Prepare the Tester
    Rinse the electrode with distilled water to avoid contamination from previous samples.
  2. Turn On the Device
    Press the power button to activate the MW804 MAX.
  3. Collect the Water Sample
    Obtain a representative sample of the drinking water or filtered water in a clean container. If testing directly from a tap or filtration outlet, ensure water flows steadily.
  4. Immerse the Electrode
    Submerge the sensor fully into the water sample, avoiding contact with the container’s sides or bottom. Stir gently to remove any air bubbles.
  5. Wait for Stable Readings
    Allow the readings for pH, EC, TDS, and temperature to stabilize on the display.
  6. Record and Analyze Data
    Note the results and compare them against regulatory standards or system specifications to verify water safety and treatment efficiency.
  7. Regular Testing & Calibration
    Conduct routine tests to monitor water quality over time and recalibrate the device regularly for consistent accuracy.
  8. Clean and Store
    After testing, clean the electrode with distilled water and store the device as per manufacturer guidelines to maintain performance.

 

Environmental Monitoring

Monitoring the quality of natural water bodies – such as rivers, lakes, and wetlands – is critical for protecting ecosystems, wildlife, and human health. The Milwaukee MW804 MAX offers a reliable solution to assess key water quality parameters including pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature, all of which provide valuable insights into pollution levels and environmental changes.

Variations in pH can indicate acid rain impact or chemical spills, while EC and TDS levels reveal the presence of dissolved salts, pollutants, or runoff contaminants. Temperature readings help understand thermal pollution and its effects on aquatic life. By using the MW804 MAX in the field, environmental scientists, conservationists, and regulatory agencies can quickly detect changes, evaluate water health, and support initiatives to safeguard natural resources.

How to Use the MW804 MAX for Environmental Monitoring

  1. Prepare the Tester
    Clean the electrode with distilled water before use to prevent cross-contamination between sites.
  2. Power On the Device
    Press the power button to switch on the MW804 MAX.
  3. Select Sampling Location
    Choose a representative area of the water body – near the surface or at various depths, depending on monitoring goals.
  4. Collect Water Sample
    Use a clean container or submerge the tester probe directly into the water, ensuring the electrode is fully immersed without touching sediments or debris.
  5. Allow Readings to Stabilize
    Wait until the pH, EC, TDS, and temperature readings stabilize on the display.
  6. Record Data
    Document the readings along with sampling location, time, and environmental conditions for trend analysis.
  7. Repeat Sampling
    Conduct tests regularly to monitor changes over time and detect potential pollution events early.
  8. Clean After Use
    Rinse the electrode with distilled water and dry before storing the instrument safely.

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