{"product_id":"fauna-marin-salinity-reference-100ml-fm-sref-25","title":"Fauna Marin Salinity Reference 100ml","description":"\u003cp\u003eFauna Marin Salinity Reference is a pre-measured calibration solution used to verify and calibrate a refractometer or hydrometer against a known salinity value, in a 100ml bottle.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCalibration value: 35 ppt salinity\u003c\/li\u003e\n\u003cli\u003eSpecific gravity: 1.0264\u003c\/li\u003e\n\u003cli\u003eRefractive index: 1.3394\u003c\/li\u003e\n\u003cli\u003eConductivity: 53 uS\/cm at 25 degrees C\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhy this matters: a refractometer that drifts out of calibration will read salinity wrong in a way that's easy to miss day-to-day, since the tank still looks normal. Checking it periodically against a known 35ppt reference solution catches that drift before it leads to a salinity swing during a water change.\u003c\/p\u003e\u003cp\u003eCompatible with: optical and digital refractometers; can also be used to spot-check hydrometers and salinity probes.\u003c\/p\u003e","brand":"Fauna Marin","offers":[{"title":"Default Title","offer_id":46000594452524,"sku":"FM-SREF-25","price":17.31,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.marineconceptsupply.com\/products\/fauna-marin-salinity-reference-100ml-fm-sref-25","provider":"Marine Concept Supply","version":"1.0","type":"link"}