{"product_id":"milwaukee-se300-lab-grade-double-junction-orp-probe-platinum-bnc-mw500-pro","title":"Milwaukee SE300 Lab-Grade Double Junction ORP Probe – Platinum Electrode, BNC, ±2000 mV | MW500 PRO Replacement","description":"\u003ch2\u003eMilwaukee SE300 Lab-Grade Double Junction ORP Probe – Platinum Electrode for MW500 PRO\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMilwaukee SE300\u003c\/strong\u003e is a precision, lab-grade \u003cstrong\u003eORP (Oxidation-Reduction Potential) replacement probe\u003c\/strong\u003e engineered for the \u003cstrong\u003eMilwaukee MW500 PRO ORP Meter\u003c\/strong\u003e and other Milwaukee BNC-compatible meters. Featuring a \u003cstrong\u003eplatinum sensing element\u003c\/strong\u003e and a \u003cstrong\u003edouble junction Ag\/AgCl gel-filled reference\u003c\/strong\u003e, the SE300 delivers stable, accurate redox measurements from \u003cstrong\u003e−2000 to +2000 mV\u003c\/strong\u003e across the widest range of laboratory, industrial, and water treatment applications.\u003c\/p\u003e\n\n\u003cp\u003eIf 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.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePlatinum Sensing Element:\u003c\/strong\u003e High-purity platinum electrode for accurate, repeatable ORP\/redox measurements\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eDouble Junction Design:\u003c\/strong\u003e Dual reference barrier prevents sample contamination from heavy metals, sulfides, proteins, and other interferents\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eGel-Filled Ag\/AgCl Reference:\u003c\/strong\u003e Maintenance-free — no refilling required; superior stability in demanding samples\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWide mV Range:\u003c\/strong\u003e −2000 to +2000 mV — covers oxidizing and reducing conditions across all applications\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eBNC Quick-Connect:\u003c\/strong\u003e Universal BNC connector for fast, secure attachment to MW500 PRO and other Milwaukee BNC meters\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWide Temperature Range:\u003c\/strong\u003e 0 to 100°C (32 to 212°F)\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCombination Design:\u003c\/strong\u003e Integrated sensing and reference electrodes in one probe — simplified setup, no separate reference needed\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eLab-Grade Construction:\u003c\/strong\u003e Built for frequent use in demanding laboratory and industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Double Junction?\u003c\/h2\u003e\n\u003cp\u003eSingle-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 \u003cstrong\u003edouble junction design\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e💧 \u003cstrong\u003eWater Treatment:\u003c\/strong\u003e Monitor oxidation effectiveness and disinfectant residual in municipal and industrial water systems\u003c\/li\u003e\n\u003cli\u003e🏊 \u003cstrong\u003eSwimming Pools \u0026amp; Spas:\u003c\/strong\u003e Verify sanitizer ORP levels (typically 650–750 mV for pools) for safe, effective disinfection\u003c\/li\u003e\n\u003cli\u003e🏭 \u003cstrong\u003eWastewater Treatment:\u003c\/strong\u003e Control oxidation processes and confirm treatment effectiveness before discharge\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eHydroponics \u0026amp; Aquaculture:\u003c\/strong\u003e Optimize nutrient solution redox for plant and aquatic health\u003c\/li\u003e\n\u003cli\u003e🔬 \u003cstrong\u003eLaboratory \u0026amp; Research:\u003c\/strong\u003e Accurate redox potential measurement for analytical chemistry and environmental science\u003c\/li\u003e\n\u003cli\u003e🍾 \u003cstrong\u003eFood \u0026amp; Beverage:\u003c\/strong\u003e Verify sanitizer effectiveness in CIP (clean-in-place) and production environments\u003c\/li\u003e\n\u003cli\u003e💊 \u003cstrong\u003ePharmaceutical Manufacturing:\u003c\/strong\u003e Process control and quality assurance in regulated environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUnderstanding ORP Measurement\u003c\/h2\u003e\n\u003cp\u003eORP (Oxidation-Reduction Potential), also called redox potential, measures a solution’s ability to oxidize or reduce substances. \u003cstrong\u003ePositive ORP\u003c\/strong\u003e values indicate oxidizing conditions (e.g., chlorinated water, ozone treatment), while \u003cstrong\u003enegative ORP\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Equipment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e🔌 \u003cstrong\u003ePrimary:\u003c\/strong\u003e Milwaukee MW500 PRO ORP Meter\u003c\/li\u003e\n\u003cli\u003e🔌 \u003cstrong\u003eAlso compatible with:\u003c\/strong\u003e Other Milwaukee ORP\/mV meters with BNC connector\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eMaintenance \u0026amp; Care\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SE300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eORP\/mV Range:\u003c\/strong\u003e −2000 to +2000 mV\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 0 to 100°C (32 to 212°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensing Element:\u003c\/strong\u003e Platinum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference Type:\u003c\/strong\u003e Double junction, Ag\/AgCl, gel-filled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector:\u003c\/strong\u003e BNC (quick-connect)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e 1 m (3 ft)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.7 oz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade:\u003c\/strong\u003e Laboratory\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Romania\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e SE300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e 810666009213\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e⚠️ Milwaukee MW500 PRO ORP Meter sold separately. Regular calibration with ORP standard solutions recommended for optimal accuracy.\u003c\/em\u003e\u003c\/p\u003e","brand":"MILWAUKEE INSTRUMENTS","offers":[{"title":"Default Title","offer_id":39348923334743,"sku":"SE300","price":94.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/products\/SE300.jpg?v=1724523733","url":"https:\/\/getultimatenow.com\/products\/milwaukee-se300-lab-grade-double-junction-orp-probe-platinum-bnc-mw500-pro","provider":"Get Ultimate Now ","version":"1.0","type":"link"}