Milwaukee SE220 Double Junction pH Probe – Lab-Grade Replacement for MW101 & MW102
Precision starts at the probe. The Milwaukee SE220 is a professional lab-grade double junction pH electrode engineered for accurate, repeatable pH measurement in the most demanding laboratory, industrial, and quality control environments. Designed as the ideal replacement probe for Milwaukee MW101 and MW102 PRO portable pH meters, the SE220 delivers superior stability, minimal maintenance, and extended service life — even in challenging sample matrices that defeat standard single-junction electrodes.
Key Features
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Double Junction Design: Dual reference junction creates an additional barrier between the reference electrolyte and your sample — preventing contamination and dramatically extending probe life when testing samples with proteins, heavy metals, sulfides, or other electrode-poisoning substances.
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Gel-Filled Ag/AgCl Reference: Sealed gel electrolyte ensures stable, drift-free readings with zero refilling required — less maintenance, more uptime.
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Lab-Grade Precision: Professional-quality spherical glass membrane electrode engineered for accurate, repeatable pH measurements in research, QC, and industrial settings.
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Universal BNC Quick-Connect: Tight, reliable BNC fitting compatible with MW101, MW102, and all Milwaukee BNC-equipped pH meters.
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Automatic Temperature Compensation (ATC): Built-in ATC delivers accurate readings across varying temperature conditions without manual correction.
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Wide pH Range: Measures pH 0–13, covering virtually all sample types from strong acids to alkaline solutions.
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Wide Temperature Range: Operates from 32–212°F (0–100°C) for versatile use across environments.
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Rugged, Durable Construction: Built to withstand frequent use in demanding lab and industrial conditions.
Applications
- Laboratory research & quality control testing
- Industrial process monitoring & wastewater treatment
- Environmental & drinking water testing
- Food & beverage production, brewing & winemaking
- Pharmaceutical & biotech manufacturing
- Hydroponics & aquaculture nutrient monitoring
- Any application requiring lab-grade accuracy in difficult sample matrices
Compatible Meters
- Milwaukee MW101 PRO Portable pH Meter
- Milwaukee MW102 PRO Portable pH/Temperature Meter
- All Milwaukee pH meters with BNC connector
Why Double Junction Over Single Junction?
Single-junction electrodes are vulnerable to contamination from samples containing proteins, heavy metals, sulfides, or oxidizing agents — leading to sluggish response, drift, and premature failure. The SE220’s double junction design adds a second reference chamber that shields the Ag/AgCl reference from sample interference, delivering longer probe life, more stable readings, and lower total cost of ownership in demanding applications.
Maintenance & Care
- Gel-filled reference requires no refilling — minimal maintenance by design
- Store with protective cap filled with pH storage/reference solution to prevent membrane drying
- Clean the junction regularly to prevent clogging and maintain fast response time
- Calibrate regularly with pH 4.01, 7.01, and 10.01 buffer solutions for optimal long-term accuracy
Technical Specifications
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pH Range: 0–13
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Temperature Range: 32–212°F (0–100°C)
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Reference Type: Double junction, Ag/AgCl, gel electrolyte
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Membrane Shape: Spherical glass
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Connector: BNC (quick-connect)
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Cable Length: 3 ft (1 m)
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Weight: 12 oz
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Grade: Laboratory
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SKU: SE220
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Barcode (UPC): 742880755884
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Country of Origin: Romania
Note: MW101 and MW102 meters sold separately. For best results, calibrate with Milwaukee pH 4.01, 7.01, and 10.01 buffer solutions before each use.
Pro tip: Pair the SE220 with Milwaukee pH buffer solutions and KCl storage solution for a complete probe maintenance kit — maximizing accuracy and probe longevity.
