Product Description
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
3-in-1 Testing — Measure pH, EC, and TDS with one meter and one probe; no juggling multiple devices or probes
±0.2 pH Lab-Grade Accuracy — Reliable, professional results you can trust for critical water quality decisions
Automatic Temperature Compensation (ATC) — Built-in temperature correction from 32–122°F (0–50°C) for consistent readings regardless of sample temperature
Replaceable SE600 Combination Probe — Fiber junction design resists fertilizer and nutrient contamination, extending probe life in demanding hydroponic and aquaculture environments
Simple 1-Point Manual Calibration — Easy calibration for both pH and EC with included calibration solutions
Rugged & Portable — Lightweight design (0.36 lbs with battery) with a large, easy-to-read display for field and bench use
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
pH Range: 0.0 – 14.0 pH | Resolution: 0.1 pH | Accuracy: ±0.2 pH
EC Range: 0 – 1990 µS/cm | Resolution: 10 µS/cm | Accuracy: ±2% FS
TDS Range: 0 – 1990 ppm | Resolution: 10 ppm | Accuracy: ±2% FS
Temperature Compensation: Automatic (ATC), 32–122°F (0–50°C)
Probe: SE600 combination pH/EC/TDS probe with 3-foot cable
Calibration: Manual 1-point for pH & EC
TDS Conversion Factor: 0.5
Battery: 1 × 9V alkaline | Battery Life: 150 hours
Dimensions: 7.3 × 3.2 × 1.8 in (185 × 82 × 45 mm)
Weight: 0.36 lbs / 0.165 kg (with battery)
SKU: MW801 | Barcode: 810666003815
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:
Storage: Always store with the cap filled with buffer or storage solution — never plain water
Cleaning: Soak the probe regularly in cleaning solution to remove residue and salt deposits
Calibration: Calibrate after cleaning and before each testing session
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.
