Milwaukee pH58 MAX Waterproof 3-in-1 pH/ORP/Temperature Tester
The Milwaukee pH58 MAX is a professional-grade, waterproof 3-in-1 tester measuring pH, ORP, and Temperature in a single rugged device. With ±0.05 pH accuracy, an extended pH range of -2.0 to 16.0, and a replaceable double-junction probe, it delivers lab-quality results at a fraction of the cost — ideal for beer brewing, wine making, food production, hydroponics, water treatment, pools, and education.
Why Choose the pH58 MAX?
Imagine never second-guessing your water quality again. Whether you're dialing in your hydroponic nutrient solution, verifying pool safety, or QC-testing a food batch, the pH58 MAX gives you fast, reliable, digital readings — no more guesswork with litmus paper.
Key Features
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3-in-1 Measurement: pH, ORP (mV), and Temperature in one device
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Extended pH Range: -2.0 to 16.0 pH | Resolution: 0.01 pH
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High Accuracy: ±0.05 pH | ±1 mV ORP | ±0.5°C Temperature
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IP65 Waterproof: Fully splash and submersion resistant
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Dual-Level LCD Display: Easy-to-read with graphic symbols
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Auto 1 or 2-Point Calibration: Two sets of pre-memorized buffers (pH 4.01, 7.01, 10.01) or (pH 4.01, 6.86, 9.18)
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Replaceable Double-Junction Probe (Mi58P): Longer life, lower long-term cost
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250+ Hour Battery Life: 4x LR44 batteries included
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Lightweight: Only 3.5 oz (99g) — half the weight of comparable testers
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Auto-Off: Powers down after 8 minutes of non-use
Full Specifications
- pH Range: -2.0 to 16.0 pH
- ORP Range: ±1000 mV
- Temperature Range: -5.0 to 60.0°C (23 to 140°F)
- pH Resolution: 0.01 pH | ORP Resolution: 1 mV | Temp Resolution: 0.1°C
- pH Accuracy: ±0.05 pH @25°C | ORP Accuracy: ±1 mV | Temp Accuracy: ±0.5°C (±1°F)
- Temperature Compensation: Automatic (-5 to 60°C)
- Probe: Replaceable double junction Mi58P
- Battery: 4 × 1.5V LR44/A76 (included) | ~250 hours
- Dimensions: 7.9" × 1.5" (diameter) | Weight: 3.5 oz (99.22g)
- Operating Environment: -5 to 50°C; max RH 100%
- Waterproof Rating: IP65
Care & Maintenance
Maximize probe life with proper storage and cleaning:
- Always store upright with the cap filled with MA9015 Storage Solution for best results.
- Clean regularly by soaking in cleaning solution MA9016.
- Calibrate after cleaning or extended storage.
- Gently stir the probe in the sample for faster, more stable readings.
⚠️ Never store in distilled (DI) or Reverse Osmosis (RO) water — this damages probe sensitivity. Add the PH-Main Maintenance Kit to your order for complete care.
