Milwaukee MW804 MAX Waterproof 4-in-1 pH/EC/TDS/Temp Meter
The all-in-one solution for serious growers, aquaculture professionals, and water quality technicians. The Milwaukee MW804 MAX measures pH, EC, TDS, and temperature simultaneously in a single waterproof instrument — eliminating the need for multiple testers. With ±0.05 pH accuracy, a replaceable double-junction gel-filled electrode, and full IP65 waterproof construction, the MW804 MAX is built for demanding field and lab environments.
Key Features
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±0.05 pH Accuracy — Automatic 1 or 2-point calibration with 5 memorized calibration points for fast, precise results
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4-in-1 Measurement — pH, EC, TDS, and temperature in one compact instrument; no need for multiple testers
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IP65 Waterproof — Fully sealed against water ingress; safe to use in wet, humid, and field environments
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Replaceable pH Probe (Mi60P) — Double-junction gel-filled electrode for low maintenance, high performance, and extended service life
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Exposed Temperature Probe — Located close to the pH probe for fast, accurate automatic temperature compensation (ATC)
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Large Dual-Level LCD — Displays multiple readings simultaneously; stability indicator and hold function freeze the display for easy recording
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Lightweight at 3.5 oz — Up to half the weight of comparable testers; easy to handle during extended use
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~100 Hours Battery Life — Auto shut-off and low power demand; batteries included
Measurement Ranges & Accuracy
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pH: 0.00 – 14.00 pH | Accuracy: ±0.05 pH
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EC: 0 – 20.00 mS/cm | Accuracy: ±2% Full Scale
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TDS: 0 – 10.00 ppt | Accuracy: ±2% Full Scale
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Temperature: 0.0 – 50.0°C / 32.0 – 122.0°F | Accuracy: ±0.5°C / ±1°F
Product Specifications
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SKU: MW804
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Model: MW804 MAX
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Parameters: pH, EC, TDS, Temperature
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Waterproof Rating: IP65
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Calibration: Automatic 1 or 2-point, 5 saved calibration points
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Electrode: Gel-filled, double-junction, replaceable (Mi60P)
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Display: Dual-level LCD with stability indicator and hold function
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Weight: 3.5 oz
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Battery Life: ~100 hours continuous use (batteries included)
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Country of Origin: Romania
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Compatible Calibration Solutions: PH-START, MA9010, M10010B (pH); MA9060, M10030B (EC)
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Replacement Electrode: Mi60P
Recommended Accessories
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PH-START / MA9010 / M10010B — pH calibration buffer solutions (4.01, 7.01, 10.01)
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MA9060 / M10030B — EC calibration solution (12,880 µS/cm)
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PH-Main — pH Maintenance Kit (cleaning + conditioning solution; highly recommended)
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MA9015 — Electrode storage solution (store probe upright in MA9015 for best results)
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MA9016 — Electrode cleaning solution (soak 20 minutes for thorough cleaning)
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Mi60P — Replacement pH electrode
Probe Care & Maintenance
- Always store upright with the cap full of MA9015 storage solution for best results.
- Clean regularly by soaking in MA9016 cleaning solution for ~20 minutes.
- Calibrate after cleaning or storage before testing to adjust for changes in the pH sensor.
- Gently stir the tester in the sample for a faster, more stable reading.
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Never store in distilled (DI) or reverse osmosis (RO) water — this will damage probe sensitivity.
Ideal Applications
The MW804 MAX is trusted by hydroponics growers, aquaculture and aquaponics operators, pool & spa technicians, water quality labs, environmental monitoring professionals, and aquarium hobbyists who need accurate, simultaneous pH, EC, TDS, and temperature readings in a single rugged instrument.
Milwaukee Instruments: precision water quality measurement tools engineered for professionals who demand accuracy, durability, and ease of use in every environment.
