{"product_id":"milwaukee-mi509-100-ph-reagent-kit","title":"Milwaukee MI509-100 pH Reagent Kit | 100 Tests for MI411 Photometer","description":"\u003ch2\u003eMilwaukee MI509-100 pH Reagent Kit (100 Tests)\u003c\/h2\u003e\u003cp\u003eMeasure water pH with speed and accuracy using the \u003cstrong\u003eMilwaukee MI509-100 pH Reagent Kit\u003c\/strong\u003e — 100 pre-made phenol red liquid reagent tests formulated specifically for the \u003cstrong\u003eMilwaukee MI411 Free \u0026amp; Total Chlorine \u0026amp; pH Photometer\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003eThe phenol red colorimetric method delivers fast, reliable pH readings across the critical 6.5–8.0 range — the most important pH window for pool safety, drinking water compliance, and aquatic system management. Simply add the reagent to your water sample, wait for the color reaction, and let the MI411 photometer determine the exact pH value.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 Pre-Made Liquid Tests:\u003c\/strong\u003e Ready-to-use reagents — no preparation, no measuring errors, no dilution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenol Red Method:\u003c\/strong\u003e Proven colorimetric indicator for accurate pH measurement in the 6.5–8.0 range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 6.5 – 8.0 pH units — covers the critical range for pool, drinking water, and aquatic applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMI411-Specific Formulation:\u003c\/strong\u003e Calibrated to the Milwaukee MI411 photometer’s optical system for maximum accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpiration Date \u0026amp; Lot Number:\u003c\/strong\u003e Every test is marked for full traceability and quality assurance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision \u0026amp; Ease of Use:\u003c\/strong\u003e Add reagent, wait for color reaction, insert cuvette into MI411 — pH result in seconds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy pH Matters\u003c\/h3\u003e\u003cp\u003epH is one of the most critical water quality parameters across virtually every water application. In swimming pools, pH outside the 7.2–7.8 range reduces chlorine effectiveness, causes swimmer irritation, and accelerates equipment corrosion. In drinking water, pH affects taste, pipe integrity, and disinfection efficiency. In aquaculture and aquariums, pH directly impacts fish health and biological filtration. The MI509-100 gives you fast, accurate pH data to keep your water in balance.\u003c\/p\u003e\u003ch3\u003eHow It Works\u003c\/h3\u003e\u003cp\u003eThe phenol red indicator changes color across the pH 6.5–8.0 range — from yellow at low pH to red\/magenta at high pH. The MI411 photometer measures the color intensity photometrically and converts it to a precise pH reading, eliminating the subjectivity of visual color comparison strips.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003eFill a clean cuvette with your water sample to the fill line\u003c\/li\u003e\n\u003cli\u003eAdd one MI509-100 reagent test to the cuvette\u003c\/li\u003e\n\u003cli\u003eCap and gently mix until the reagent is fully dissolved\u003c\/li\u003e\n\u003cli\u003eWait for the color reaction to develop (per MI411 instructions)\u003c\/li\u003e\n\u003cli\u003eWipe the outside of the cuvette and insert into the MI411 photometer\u003c\/li\u003e\n\u003cli\u003eSelect pH mode and read the result on the display\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eCompatible With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhotometer:\u003c\/strong\u003e Milwaukee MI411 Free \u0026amp; Total Chlorine \u0026amp; pH Photometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Parameter:\u003c\/strong\u003e pH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 6.5 – 8.0 pH units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e Phenol red colorimetric\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSwimming pool and spa pH monitoring\u003c\/li\u003e\n\u003cli\u003eDrinking water treatment pH compliance testing\u003c\/li\u003e\n\u003cli\u003eAquaculture and fish farm water quality\u003c\/li\u003e\n\u003cli\u003eAquarium and reef tank pH management\u003c\/li\u003e\n\u003cli\u003eRecreational water facility management\u003c\/li\u003e\n\u003cli\u003eLaboratory water quality analysis\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e MI509-100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Milwaukee Instruments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Parameter:\u003c\/strong\u003e pH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTesting Method:\u003c\/strong\u003e Phenol red colorimetric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 6.5 – 8.0 pH units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 100 liquid reagent tests\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Meter:\u003c\/strong\u003e Milwaukee MI411 Photometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMPN:\u003c\/strong\u003e MI509-100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 810666001010\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eStorage \u0026amp; Handling\u003c\/h3\u003e\u003cp\u003eStore in a cool, dry place away from direct sunlight and heat. Keep reagents sealed until ready to use. Do not use reagents that appear discolored or show signs of contamination. Always check the expiration date and lot number before use to ensure reagent integrity and measurement accuracy.\u003c\/p\u003e\u003cp\u003eNeed chlorine testing too? See the \u003cstrong\u003eMilwaukee MI511-100\u003c\/strong\u003e — a complete Free Chlorine, Total Chlorine \u0026amp; pH reagent kit for the MI411 in a single package. Pair with \u003cstrong\u003eMilwaukee MI0001 Glass Cuvettes\u003c\/strong\u003e for a complete photometric testing setup.\u003c\/p\u003e","brand":"MILWAUKEE INSTRUMENTS","offers":[{"title":"Default Title","offer_id":41062931857495,"sku":"MI509","price":29.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/pH_Reagent__53837.1614951720_1.jpg?v=1718997166","url":"https:\/\/getultimatenow.com\/products\/milwaukee-mi509-100-ph-reagent-kit","provider":"Get Ultimate Now ","version":"1.0","type":"link"}