{"product_id":"rs-refractometer","title":"RS Refractometer","description":"\u003cdiv class=\"titlesContainer\"\u003e\n\u003ch1 class=\"title\"\u003eSEAWATER REFRACTOMETER\u003c\/h1\u003e\n\u003ch2 class=\"subtitle\"\u003eHigh-Accuracy Seawater Refractometer\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"text\"\u003e\n\u003cdiv class=\"right\"\u003e\n\u003cdiv class=\"gallery\"\u003e\n\u003cdiv class=\"gallery_top\"\u003e\n\u003cdiv class=\"gallery_top_item\"\u003e\n\u003cdiv class=\"tablecell\"\u003e\u003cimg src=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/RefractometerBox.png\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 class=\"title18\"\u003eRed Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25°C \/ 77°F.\u003c\/h3\u003e\n\u003cp\u003eMost refractometers used within the aquarium hobby are not specifically designed for reef aquariums and use an algorithm for the measurement of brine (NaCl – rather than seawater) at a temperature of 15°C \/ 59°F rather than 25°C \/ 77°F. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.\u003c\/p\u003e\n\u003cdiv class=\"title16\"\u003e\n\u003cp class=\"x_MsoNormal\" dir=\"RTL\"\u003e \u003c\/p\u003e\n\u003cdiv class=\"help_bar is-single\"\u003e\n\u003cdiv class=\"prod-links clearfix\"\u003e\n\u003cdiv class=\"left prod-link-item\"\u003e\u003ca href=\"https:\/\/g1.redseafish.com\/support\/product-support\/products\/seawater-refactometer\/tabs\/files\/manuals\"\u003e\u003cspan class=\"prod-link-item__in\"\u003eManual\u003c\/span\u003e\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4 class=\"title16\"\u003eRed Sea’s Seawater Refractometer Introduction \u003ca href=\"https:\/\/www.youtube.com\/watch?v=fXY6IycuTdE\" target=\"_blank\" rel=\"noopener noreferrer\"\u003evideo\u003c\/a\u003e\n\u003c\/h4\u003e\n\u003chr\u003e\n\u003ch3 class=\"title16 title18\"\u003eMain features of Red Sea’s Seawater Refractometer include:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDirectly reads the \u003cstrong\u003eabsolute\u003c\/strong\u003e \u003cstrong\u003esalinity\u003c\/strong\u003e\u003cstrong\u003e of\u003c\/strong\u003e \u003cstrong\u003eseawater\u003c\/strong\u003e \u003cstrong\u003eat\u003c\/strong\u003e \u003cstrong\u003e25°C \/ 77°F \u003c\/strong\u003e ( No need for seawater or temperature compensation factors)\u003c\/li\u003e\n\u003cli\u003eSpecifically designed for the ionic content of seawater (NSW) for more accurate salinity measurement (industry standard refractometers are calibrated for salt brine ).\u003c\/li\u003e\n\u003cli\u003eCalibrated for seawater (NSW) at 25°C \/ 77°F, the normal temperature range for reef aquariums\u003cbr\u003e(most standard refractometers are calibrated at of 15°C \/ 59°F ).\u003c\/li\u003e\n\u003cli\u003eEasier to read, higher resolution display, focussed to the relevant range for reef aquariums of up to 40ppt\u003c\/li\u003e\n\u003cli\u003eIncludes Integrated Automatic  Temperature Compensation (ATC) for accurate measurement at standard ambient temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"title16\"\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3 class=\"title16 title18\"\u003eRed Sea’s Refractometer display\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe PPT scale on Red Sea’s Seawater refractometer is calculated using an algorithm for seawater and therefore will give a reading of the \u003cstrong\u003eAbsolute Salinity\u003c\/strong\u003e of seawater.\u003c\/p\u003e\n\u003cp\u003eThe PPT scale on regular salinity refractometers are calculated using an algorithm for Brine. Using a Brine refractometer for Seawater will give an error of approximately 1.5ppt in the salinity reading.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cimg class=\"alignnone\" title=\"Red Sea’s Seawater salinity refractometer\" src=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/Red-Sea-Refratometer.jpg\" alt=\"Red Sea’s Seawater refractometer red sea seawater refractometer. salinity test for saltwater aquariums\" width=\"373\" height=\"233\"\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003ca href=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/refractometer.jpg\"\u003e\u003cimg src=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/refractometer.jpg\" alt=\"refractometer\" width=\"373\" height=\"233\"\u003e\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003eRed Sea’s Seawater Refractometer display\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003eTypical Salinity Refractometer display\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch4 class=\"title18 title16\"\u003eAbout Salinity\u003c\/h4\u003e\n\u003cdiv class=\"title18\"\u003e \u003c\/div\u003e\n\u003cp\u003eSalinity is a general term describing the concentration of salt in water. However, solutions of different type of salts have different refractive indexes.\u003c\/p\u003e\n\u003cp\u003eBrine is a solution of Sodium Chloride (table salt) that contains 2 chemical elements.\u003c\/p\u003e\n\u003cp\u003eSeawater contains approximately 70 chemical elements that include Calcium, Magnesium, Potassium etc. in addition to the Sodium Chloride.\u003c\/p\u003e\n\u003cp\u003eSeawater and Brine of the same salinity (i.e. the same weight of salt\/liter) have different refractive indexes and will give different salinity readings if measured on the same refractometer.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch4 class=\"title18 title16\"\u003eRefraction \u0026amp; refractive index\u003c\/h4\u003e\n\u003cp\u003eAll transparent materials such as liquids refract (distort) light.\u003c\/p\u003e\n\u003cp\u003eAll transparent materials refract light differently and have what is called a “refractive index” which means how much a particular material distorts light.\u003c\/p\u003e\n\u003cp\u003eDifferent concentrations of the same liquid have different refractive indexes.\u003c\/p\u003e\n\u003cp\u003eThe scale of a refractometer is calculated by using a mathematical algorithm that relates the measured refraction to its concentration for a specific liquid.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/Refraction.jpg\"\u003e\u003cimg class=\"alignnone size-full wp-image-5362\" src=\"https:\/\/g1.redseafish.com\/wp-content\/uploads\/2014\/02\/Refraction.jpg\" alt=\"Refraction\" width=\"738\" height=\"400\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 class=\"title18 title16\"\u003eRefractive index and temperature\u003c\/h4\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe refractive index of liquids change with temperature and therefore has a major effect on measuring salinity with a refractometer.\u003c\/p\u003e\n\u003cp\u003eThe algorithm for defining the PPT (and S.G.) scale for a refractometer is calculated for a specific temperature.\u003c\/p\u003e\n\u003cp\u003ePPT readings from refractometers that are not calibrated for reef aquariums (i.e. 25\u003cstrong\u003e\u003csup\u003eo\u003c\/sup\u003e\u003c\/strong\u003eC) need to be adjusted according to a conversion table to give the actual PPT at the aquarium temperature. This is often a cause for misinterpretation of refractometer readings.\u003c\/p\u003e\n\u003cp\u003eFor example, using a seawater refractometer calibrated at 20\u003cstrong\u003e\u003csup\u003eo\u003c\/sup\u003e\u003c\/strong\u003eC will give a PPT reading that is approximately 1-1.5ppt lower than the absolute salinity of the same water sample at the normal aquarium temperature of 25\u003cstrong\u003e\u003csup\u003eo\u003c\/sup\u003e\u003c\/strong\u003eC.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 class=\"title16\"\u003e\u003cstrong\u003eTherefore, Red Sea’s Seawater Refractometer calibrated at 25\u003csup\u003e°\u003c\/sup\u003eC\/77\u003csup\u003e 0\u003c\/sup\u003eF directly reads the absolute salinity of seawater with no need for temperature compensation factor)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 class=\"title16\"\u003e ATC – Automatic temperature compensation\u003c\/h4\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTemperature is probably the biggest cause of wrong readings with a refractometer. Calibration and testing of water samples should be done after the refractometer and water sample have equalized at the correct temperature.\u003c\/p\u003e\n\u003cp\u003eAutomatic temperature compensation (ATC) compensates for a few degrees of difference between the ambient temperature and the calibrated temperature of the refractometer. Larger temperature variations will give an error of approximately 1.0ppt in the salinity reading.\u003c\/p\u003e\n\u003cp\u003eATC does not adjust the PPT reading of a refractometer to the temperature of the aquarium!\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Aquatics Galore","offers":[{"title":"Default Title","offer_id":44523312480335,"sku":"r12018","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/6675\/6943\/files\/6ce3d306-eab4-495c-825d-00ba6ecd293c.png?v=1780545434","url":"https:\/\/415fa3-2.myshopify.com\/products\/rs-refractometer","provider":"Aquatics Galore","version":"1.0","type":"link"}