{"product_id":"hanna-hi758-marine-calcium-checker-test-kit-for-saltwater-aquariums","title":"Hanna HI758 Marine Calcium Checker Test Kit for Saltwater Aquariums","description":"\u003ch2\u003eCalcium testing made simple for saltwater aquariums\u003c\/h2\u003e\n\u003cp\u003eIn marine systems, calcium is a foundational element that supports coral skeletons, shell-forming organisms, and vibrant reef growth. Water sources vary in calcium content and may require careful monitoring as you plan feeding, dosing, and water changes. The HI758 Marine Calcium Checker HC is a handheld solution designed to deliver quick, on-site readings without sending samples away. Its compact, pocket-friendly form makes it easy to keep near the tank stand where hobbyists spend their maintenance time.\u003c\/p\u003e\n\u003ch3\u003eFast, two-step testing you can trust\u003c\/h3\u003e\n\u003cp\u003eThe HI758 follows a straightforward two-step process with reagents A and B and a single-button workflow. You zero, then measure, so you can stay hands-on without juggling multiple instruments. This practical approach translates to more confidence during routine checks and water changes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eZero and measure: add Reagent A, deionized water, and 0.1 mL of tank water to the vial; insert into the unit and press the button.\u003c\/li\u003e\n\u003cli\u003eDevelop and read: remove the vial, add Reagent B, shake to dissolve, reinsert, and press to read calcium in ppm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey performance you can rely on\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMeasurement range: 200–600 ppm with 1 ppm resolution.\u003c\/li\u003e\n\u003cli\u003eAccuracy: ±6% of the reading at 25°C (77°F).\u003c\/li\u003e\n\u003cli\u003eDisplay: large LCD for easy reading in varying lighting conditions.\u003c\/li\u003e\n\u003cli\u003ePower: portable handheld device powered by a single AAA battery.\u003c\/li\u003e\n\u003cli\u003eConvenience: auto-off after 10 minutes to conserve battery life.\u003c\/li\u003e\n\u003cli\u003eEnvironment: operable from 0–50°C (32–122°F) and up to 95% relative humidity when non-condensing.\u003c\/li\u003e\n\u003cli\u003eMethod: practical adaptation of the zincon method for colorimetric testing.\u003c\/li\u003e\n\u003cli\u003eOptics: 610 nm LED light source paired with a silicon photodiode for stable readings.\u003c\/li\u003e\n\u003cli\u003eSize and weight: compact dimensions (about 3.2\" x 2.4\" x 1.5\") for one-handed use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReal-world uses you can imagine\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDuring water changes, verify calcium before dosing to help maintain balance in your system.\u003c\/li\u003e\n\u003cli\u003eIn reef and marine tanks, monitor calcium as corals grow and require adjustments over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: The HI758 offers quick, field-ready readings that complement routine testing. Follow reagent instructions and calibrate as directed to keep results consistent while you focus on your tank’s health and appearance.\u003c\/p\u003e\n\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 the measurement range of the HI758?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The HI758 reads 200–600 ppm with 1 ppm resolution; accuracy is +\/-6% at 25°C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What makes HI758 easier than traditional test kits?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Single-button operation with reagents A and B and a compact handheld reader.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":53551944565065,"sku":"B005FH2OIY","price":80.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/1781\/9465\/files\/hanna-instruments-hi758-marine-calcium-checker-display.jpg?v=1766250802","url":"https:\/\/petvita.co.uk\/products\/hanna-hi758-marine-calcium-checker-test-kit-for-saltwater-aquariums","provider":"Petvita","version":"1.0","type":"link"}