Milwaukee MW801 PRO 3-in-1 pH, EC & TDS Combo Meter with ATC
Take complete control of your water chemistry with the Milwaukee MW801 PRO — a professional-grade, 3-in-1 combo meter that measures pH, electrical conductivity (EC), and total dissolved solids (TDS) simultaneously using a single integrated SE600 probe. Built for demanding applications in hydroponics, aquariums, aquaponics, drinking water testing, and laboratory environments, the MW801 PRO delivers lab-quality accuracy in a rugged, portable package.
Key Benefits
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3-in-1 Testing — Measure pH, EC, and TDS with one meter and one probe; no juggling multiple devices or probes
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±0.2 pH Lab-Grade Accuracy — Reliable, professional results you can trust for critical water quality decisions
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Automatic Temperature Compensation (ATC) — Built-in temperature correction from 32–122°F (0–50°C) for consistent readings regardless of sample temperature
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Replaceable SE600 Combination Probe — Fiber junction design resists fertilizer and nutrient contamination, extending probe life in demanding hydroponic and aquaculture environments
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Simple 1-Point Manual Calibration — Easy calibration for both pH and EC with included calibration solutions
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Rugged & Portable — Lightweight design (0.36 lbs with battery) with a large, easy-to-read display for field and bench use
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150-Hour Battery Life — Long-lasting 9V alkaline battery keeps you testing longer between replacements
Why the MW801 PRO?
pH, EC, and TDS levels are critical indicators of water quality in aquariums, hydroponic systems, and drinking water. Elevated TDS can reduce water clarity, affect taste, impair fish health, and limit aquatic plant photosynthesis. The MW801 PRO gives you precise, simultaneous control over all three parameters — with professional accuracy and exceptional ease of use — in one compact instrument.
Technical Specifications
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pH Range: 0.0 – 14.0 pH | Resolution: 0.1 pH | Accuracy: ±0.2 pH
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EC Range: 0 – 1990 µS/cm | Resolution: 10 µS/cm | Accuracy: ±2% FS
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TDS Range: 0 – 1990 ppm | Resolution: 10 ppm | Accuracy: ±2% FS
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Temperature Compensation: Automatic (ATC), 32–122°F (0–50°C)
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Probe: SE600 combination pH/EC/TDS probe with 3-foot cable
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Calibration: Manual 1-point for pH & EC
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TDS Conversion Factor: 0.5
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Battery: 1 × 9V alkaline | Battery Life: 150 hours
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Dimensions: 7.3 × 3.2 × 1.8 in (185 × 82 × 45 mm)
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Weight: 0.36 lbs / 0.165 kg (with battery)
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SKU: MW801 | Barcode: 810666003815
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Origin: Romania
What's Included
- MW801 PRO meter body
- SE600 combination pH/EC/TDS probe (3-foot cable)
- 9V alkaline battery
- M10007B — pH 7.01 calibration buffer solution sachet
- M10031B — 1413 µS/cm EC calibration solution sachet
- M10080B — 800 ppm TDS calibration solution sachet
- Instruction manual
Applications
- Hydroponics nutrient solution management
- Aquarium & reef tank water quality monitoring
- Aquaponics system management
- Drinking water & tap water testing
- Wastewater & environmental analysis
- Laboratory & educational use
- Pool & spa water chemistry
Probe Care & Maintenance
The SE600 probe integrates both pH and EC sensors. Proper maintenance ensures peak accuracy and extends probe life:
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Storage: Always store with the cap filled with buffer or storage solution — never plain water
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Cleaning: Soak the probe regularly in cleaning solution to remove residue and salt deposits
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Calibration: Calibrate after cleaning and before each testing session
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Technique: Gently stir the probe in the sample for faster, more accurate readings
Recommended: Pair with the Milwaukee pH Maintenance Kit (PH-Main) to clean, condition, and protect your electrode for peak long-term performance.
What Customers Say
"Superb meter, easy to use, great customer service."
"Best meter I have ever owned."
"I have owned this meter for almost 8 years and only replaced the probe once. The calibration knobs are easy to use, and even when I am less than gentle with the thing it keeps on going. I wouldn’t consider any other meter."
"The best meter on the market and Milwaukee customer service is the best."
Why Milwaukee Instruments?
Milwaukee Instruments is trusted worldwide by professionals in hydroponics, aquaculture, water treatment, and laboratory science. The MW801 PRO combines Milwaukee’s reputation for rugged construction, long-term reliability, and exceptional customer support — backed by years of proven performance in the most demanding water testing applications.
