{"product_id":"hanna-marine-magnesium-checker-reagents-25-tests-hi783-25-pre-made-high-purity-edta-reagents","title":"Hanna Marine Magnesium Checker Reagents (25 Tests) HI783-25 – Pre-Made, High-Purity EDTA Reagents","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe HI783-25 Marine Magnesium Checker Reagents are replacement reagent sets designed for Hanna’s Marine Magnesium Checker HC (HI783). Each packet is pre-measured, making magnesium testing faster and more consistent. They are manufactured in Hanna’s facility using high-purity chemicals and are clearly labeled with lot numbers and expiration dates to support traceability across testing sessions. \u003c\/p\u003e\n\n\u003ch2\u003eHow the test works\u003c\/h2\u003e\n\u003cp\u003eThese reagents use a colorimetric EDTA method with a calmagite indicator. When magnesium from your seawater interacts with the reagent, the solution shifts from blue to violet. The resulting color intensity corresponds to a magnesium concentration expressed in parts per million (ppm) when read with the HI783 instrument or referenced against the color guide. \u003c\/p\u003e\n\n\u003ch2\u003eDesigned for seawater ranges\u003c\/h2\u003e\n\u003cp\u003eHI783-25 reagents are optimized for saltwater samples with an expected magnesium range of roughly 1,000 to 1,800 ppm. Using them with the Marine Magnesium Checker HC helps you compare your readings to common marine aquarium targets and maintain stable water chemistry over time.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-made reagents for ease of use\u003c\/li\u003e\n  \u003cli\u003ePrepared with high purity chemicals\u003c\/li\u003e\n  \u003cli\u003eMarked with expiration date and lot number for traceability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy this matters for hobbyists and professionals\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eFast, reproducible results with minimal preparation\u003c\/li\u003e\n  \u003cli\u003eClear color change helps readings in low-light or busy tanks\u003c\/li\u003e\n  \u003cli\u003eLot-based traceability supports consistent testing across sessions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eReal-world use cases\u003c\/h2\u003e\n\u003cp\u003eFrom reef tanks to mixed ecosystems and quarantine displays, HI783-25 reagents provide a convenient option for monitoring magnesium. They pair with the HI783 reader to deliver data you can log over time, helping you observe trends and adjust practices as needed.\u003c\/p\u003e\n\n\u003ch2\u003eQuality and handling\u003c\/h2\u003e\n\u003cp\u003eManufactured to high standards and clearly labeled for traceability, these reagents are designed to support ongoing maintenance without requiring extensive preparation. Store in a cool, dry place and use before the indicated expiration date to ensure accuracy.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is HI783-25 used for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: HI783-25 are replacement reagents for the Marine Magnesium Checker HC, pre-measured for quick, reliable magnesium testing in seawater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What range is HI783-25 designed for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are optimized for 1,000 to 1,800 ppm magnesium in saltwater samples when used with the HI783 instrument.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":53555833438537,"sku":"B0B33C2FBW","price":37.31,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/1781\/9465\/files\/hanna-marine-magnesium-reagents-25-tests.jpg?v=1766366888","url":"https:\/\/petvita.co.uk\/products\/hanna-marine-magnesium-checker-reagents-25-tests-hi783-25-pre-made-high-purity-edta-reagents","provider":"Petvita","version":"1.0","type":"link"}