Milwaukee SE300 Lab-Grade Double Junction ORP Probe – Platinum Electrode for MW500 PRO
The Milwaukee SE300 is a precision, lab-grade ORP (Oxidation-Reduction Potential) replacement probe engineered for the Milwaukee MW500 PRO ORP Meter and other Milwaukee BNC-compatible meters. Featuring a platinum sensing element and a double junction Ag/AgCl gel-filled reference, the SE300 delivers stable, accurate redox measurements from −2000 to +2000 mV across the widest range of laboratory, industrial, and water treatment applications.
If you're testing chlorinated pools, monitoring wastewater oxidation, optimizing hydroponics nutrient solutions, or running pharmaceutical-grade process control, the SE300's double junction design protects the reference from sample contamination — extending probe life and maintaining measurement integrity even in the most challenging matrices.
Key Features
- ✅ Platinum Sensing Element: High-purity platinum electrode for accurate, repeatable ORP/redox measurements
- ✅ Double Junction Design: Dual reference barrier prevents sample contamination from heavy metals, sulfides, proteins, and other interferents
- ✅ Gel-Filled Ag/AgCl Reference: Maintenance-free — no refilling required; superior stability in demanding samples
- ✅ Wide mV Range: −2000 to +2000 mV — covers oxidizing and reducing conditions across all applications
- ✅ BNC Quick-Connect: Universal BNC connector for fast, secure attachment to MW500 PRO and other Milwaukee BNC meters
- ✅ Wide Temperature Range: 0 to 100°C (32 to 212°F)
- ✅ Combination Design: Integrated sensing and reference electrodes in one probe — simplified setup, no separate reference needed
- ✅ Lab-Grade Construction: Built for frequent use in demanding laboratory and industrial environments
Why Double Junction?
Single-junction probes are vulnerable to contamination when testing samples containing heavy metals, sulfides, high protein content, or other interfering substances that can poison the reference junction and cause drift. The SE300’s double junction design adds a second barrier between the reference electrolyte and your sample — dramatically extending probe life and maintaining accuracy in difficult matrices. For demanding applications, double junction is the professional standard.
Applications
- 💧 Water Treatment: Monitor oxidation effectiveness and disinfectant residual in municipal and industrial water systems
- 🏊 Swimming Pools & Spas: Verify sanitizer ORP levels (typically 650–750 mV for pools) for safe, effective disinfection
- 🏭 Wastewater Treatment: Control oxidation processes and confirm treatment effectiveness before discharge
- 🌱 Hydroponics & Aquaculture: Optimize nutrient solution redox for plant and aquatic health
- 🔬 Laboratory & Research: Accurate redox potential measurement for analytical chemistry and environmental science
- 🍾 Food & Beverage: Verify sanitizer effectiveness in CIP (clean-in-place) and production environments
- 💊 Pharmaceutical Manufacturing: Process control and quality assurance in regulated environments
Understanding ORP Measurement
ORP (Oxidation-Reduction Potential), also called redox potential, measures a solution’s ability to oxidize or reduce substances. Positive ORP values indicate oxidizing conditions (e.g., chlorinated water, ozone treatment), while negative ORP values indicate reducing conditions (e.g., antioxidant-rich water, anaerobic environments). ORP is a critical parameter for water treatment effectiveness, sanitizer monitoring, and chemical process control.
Compatible Equipment
- 🔌 Primary: Milwaukee MW500 PRO ORP Meter
- 🔌 Also compatible with: Other Milwaukee ORP/mV meters with BNC connector
Maintenance & Care
The gel-filled reference system is maintenance-free — no refilling needed. Store the probe with the protective cap in place and the sensing element moistened. Keep the platinum element clean and free from deposits. Calibrate regularly with ORP standard solutions (e.g., 200 mV or 470 mV) for optimal accuracy.
Technical Specifications
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Model: SE300
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ORP/mV Range: −2000 to +2000 mV
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Temperature Range: 0 to 100°C (32 to 212°F)
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Sensing Element: Platinum
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Reference Type: Double junction, Ag/AgCl, gel-filled
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Connector: BNC (quick-connect)
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Cable Length: 1 m (3 ft)
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Weight: 3.7 oz
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Grade: Laboratory
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Country of Origin: Romania
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SKU: SE300
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Barcode: 810666009213
⚠️ Milwaukee MW500 PRO ORP Meter sold separately. Regular calibration with ORP standard solutions recommended for optimal accuracy.
