{"product_id":"tropic-marin-hydrometer","title":"Tropic Marin High-Precision Hydrometer","description":"\u003cp\u003e\u003cstrong\u003eAccurate specific gravity readings for saltwater tanks.\u003c\/strong\u003e Specific gravity is one of the most important water parameters in a reef or marine aquarium, and many animals are sensitive to even small changes, so it should be kept as constant as possible. For an exact, reliable measure, Tropic Marin recommends its High-Precision Hydrometer, a glass float hydrometer with a fine scale from 1.021 to 1.031. Want the matching cylinder too? Get the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/tropic-marin-hydrometer-with-measuring-cylinder\"\u003eTropic Marin Hydrometer with Measuring Cylinder\u003c\/a\u003e kit. Browse more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003ewater testing\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eHow to Measure\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eFill a measuring cylinder with no more than 400 mL of saltwater at 25 °C \/ 77 °F.\u003c\/li\u003e\n\u003cli\u003eMake sure the hydrometer is dry and clean, then gently place it in the water until it floats freely.\u003c\/li\u003e\n\u003cli\u003eRead the specific gravity on the blue part of the scale at the level of the water surface, not at the meniscus, which creeps higher at the edges.\u003c\/li\u003e\n\u003cli\u003eRinse the cylinder well with fresh tap or RO water after each use to remove salt residue that could throw off future readings.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature matters.\u003c\/strong\u003e Specific gravity drops as temperature rises, so the water should be at 25 °C \/ 77 °F for a correct result.\u003c\/p\u003e\n\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:6px 0 12px;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;width:40%;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eTropic Marin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eGlass float hydrometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eScale\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e1.021 to 1.031 specific gravity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eResolution\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e0.0001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eMaximum Deviation\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e0.001 at 25 °C \/ 77 °F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eRecommended Range\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e1.025 to 1.027 at 25 °C \/ 77 °F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eIncluded\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eHydrometer in protective tube (measuring cylinder sold separately or in the kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eFor\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eSaltwater aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat specific gravity should my reef be?\u003c\/strong\u003e\u003cbr\u003eNatural seawater at 35 ppt is 1.026 at 25 °C \/ 77 °F. Tropic Marin recommends 1.025 to 1.027 for aquarium water, depending on the type of tank.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it come with a measuring cylinder?\u003c\/strong\u003e\u003cbr\u003eNo, this is the hydrometer on its own. The \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/tropic-marin-hydrometer-with-measuring-cylinder\"\u003ekit version\u003c\/a\u003e includes Tropic Marin's 14 in measuring cylinder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the water temperature matter?\u003c\/strong\u003e\u003cbr\u003eSpecific gravity decreases as temperature increases. Measure at 25 °C \/ 77 °F so the reading matches the scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere do I read the scale?\u003c\/strong\u003e\u003cbr\u003eAt the flat water surface, not at the meniscus where the water curves up the glass.\u003c\/p\u003e\n","brand":"Tropic Marin","offers":[{"title":"Default Title","offer_id":48257860403419,"sku":"51002","price":41.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_b1931a80-b492-420e-b3a6-c4946f29702f.png?v=1770999851","url":"https:\/\/squeakysaquatics.com\/products\/tropic-marin-hydrometer","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}