{"product_id":"fritz-35-ppt-calibration-fluid-1-25oz","title":"Fritz 35 PPT Calibration Fluid","description":"\u003cp\u003eFritz 35 PPT Calibration Fluid is a precise salinity standard that keeps your refractometer or hydrometer reading accurately. Set to 35 parts per thousand, the salinity of natural seawater, it lets you calibrate your salinity tester so you can trust every reading and keep your \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003esaltwater\u003c\/a\u003e tank in the right range.\u003c\/p\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eWhy Calibrate\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSets your refractometer or hydrometer to a known standard\u003c\/li\u003e\n\u003cli\u003e35 PPT matches natural seawater (1.0264 specific gravity)\u003c\/li\u003e\n\u003cli\u003eEnsures accurate, repeatable salinity readings\u003c\/li\u003e\n\u003cli\u003eCheap insurance against a drifting instrument\u003c\/li\u003e\n\u003cli\u003eA reef-keeping essential for stable salinity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMake sure the refractometer prism is clean and dry\u003c\/li\u003e\n\u003cli\u003ePlace 2 to 3 drops of the fluid on the prism\u003c\/li\u003e\n\u003cli\u003eAdjust the calibration screw until it reads 35 PPT (1.0264 specific gravity, 1.3394 refractive index)\u003c\/li\u003e\n\u003cli\u003eRinse and dry the instrument afterward, and recheck about once a month\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\u003ctable style=\"border-collapse:collapse;margin:6px 0 4px;font-size:0.95em;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eFritz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eSalinity calibration fluid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eStandard\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e35 PPT natural seawater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eSpecific gravity\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e1.0264\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eRefractive index\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e1.3394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eSize\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e1.25 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eBest for\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eRefractometers and hydrometers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003ePair It With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCalibrate a \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/milwaukee-ma887-digital-salinity-refractometer\"\u003esalinity refractometer\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eOr check salinity with an \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/instant-ocean-aquarium-hydrometer\"\u003eInstant Ocean hydrometer\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eBrowse more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003etesting\u003c\/a\u003e gear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does 35 PPT mean?\u003c\/strong\u003e\u003cbr\u003eIt is the salinity of natural seawater, about 1.0264 specific gravity. Calibrating your instrument to it makes your readings accurate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I use it?\u003c\/strong\u003e\u003cbr\u003ePut 2 to 3 drops on a clean, dry prism and adjust the instrument to read 35 PPT.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should I calibrate?\u003c\/strong\u003e\u003cbr\u003eChecking about once a month keeps your salinity readings reliable.\u003c\/p\u003e","brand":"Fritz","offers":[{"title":"Default Title","offer_id":48176005611739,"sku":"03981","price":6.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/fritz_35ppt_1.25oz_sm__1000_1083_s.png?v=1784106567","url":"https:\/\/squeakysaquatics.com\/products\/fritz-35-ppt-calibration-fluid-1-25oz","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}