{"product_id":"milwaukee-ma911b-2-ph-probe","title":"Milwaukee MA911B\/2 Double Junction pH Probe","description":"\u003cp\u003e\u003cstrong\u003eKeep your Milwaukee pH controller reading accurately.\u003c\/strong\u003e This is the genuine Milwaukee MA911B\/2 lab-grade replacement pH probe, gel-filled with a double-junction design for reliable, low-maintenance readings. It is the correct electrode for Milwaukee MC122 and MC125 pH controllers and monitors that use the same screw-on connector.\u003c\/p\u003e\n\u003cp\u003eBrowse the rest of our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003ewater testing gear\u003c\/a\u003e to keep your parameters dialed in.\u003c\/p\u003e\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eWhy this probe\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-junction design\u003c\/strong\u003e resists clogging for a longer service life than single-junction probes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpherical glass sensing tip\u003c\/strong\u003e maximizes surface area for faster, more accurate readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGel-filled\u003c\/strong\u003e, so there is no internal solution to refill or maintain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTough polypropylene resin body\u003c\/strong\u003e shrugs off accidental knocks and protects the glass bulb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6.6 ft (2 m) cable\u003c\/strong\u003e gives you plenty of reach between the controller and your sump or tank\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for Milwaukee \u003cstrong\u003eMC122\u003c\/strong\u003e and \u003cstrong\u003eMC125\u003c\/strong\u003e pH controllers, plus Milwaukee monitors that use the same screw-type connector. This is the replacement for the MA911B\/2 electrode. It is not a universal BNC probe, so if you are replacing an older unit, match the connector on your controller before ordering.\u003c\/p\u003e\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eCare and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNever store the probe dry. Keep the tip in pH storage solution or calibration buffer between uses.\u003c\/li\u003e\n\u003cli\u003eDo not store in tap water or RO\/DI water, which permanently damages the probe's sensitivity.\u003c\/li\u003e\n\u003cli\u003eCalibrate regularly with fresh pH 4.0 and 7.0 buffers for the most accurate results.\u003c\/li\u003e\n\u003cli\u003eSoak periodically in electrode cleaning solution if you test water with heavy organics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;font-size:0.95em;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eMilwaukee Instruments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eMA911B\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eDouble-junction, gel-filled pH electrode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eCompatible with\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eMilwaukee MC122 and MC125 pH controllers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eCable length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e6.6 ft (2 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eBody\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003ePolypropylene resin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eJunction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eDouble (clog-resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003cstrong\u003eFilling\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eGel, maintenance-free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhich controllers does this fit?\u003c\/strong\u003e The MA911B\/2 is designed for Milwaukee MC122 and MC125 pH controllers and monitors that use the same screw-on connector. It is not a universal BNC probe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long do pH probes last?\u003c\/strong\u003e With proper storage and regular calibration, aquarium pH probes typically last 12 to 24 months. Keeping the tip hydrated is the single biggest factor in probe life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it in both freshwater and saltwater?\u003c\/strong\u003e Yes. The probe reads pH in fresh, planted, and reef systems alike.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to calibrate a new probe?\u003c\/strong\u003e Yes. Always calibrate a new probe with fresh pH 4.0 and 7.0 buffer solutions before relying on its readings.\u003c\/p\u003e","brand":"Milwaukee","offers":[{"title":"Default Title","offer_id":49159707427035,"sku":"MA911B-2","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/milwaukee_ph_probe.webp?v=1787165660","url":"https:\/\/squeakysaquatics.com\/products\/milwaukee-ma911b-2-ph-probe","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}