Feature:1. Suitable for warm water (20-30). A change in temperature will cause a change in the reading. Unit specific gravity is accurate to 0.001.2. Insert the hydrometer at least 15 cm deep into the tank (if the insertion line is less than 15 cm, the grease on the tank surface will affect the accuracy of the test).3. When the water reaches the state of full water (upper part with guide plate), lift the hydrometer, the product can be manually or hung on the cylinder, with automatic water level function, can automatically find the water level, to avoid errors.4. Bubble attachment on the pointer may cause incorrect reading. Please use the hydrometer to carefully buffer bubble attachment.5. Based on the internal reading of the scale, based on the salinity of the horizontal scale (PPT). The recommended ratio of water in a tank is between 1,020 and 1,023 (safe range). Rinse with water after each useSpecification:@font-face{font-family:"Times New Roman";}@font-face{font-family:"";}@font-face{font-family:"Calibri";}p.MsoNormal{mso-style-name:;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Calibri;mso-fareast-font-family:;mso-bidi-font-family:'Times New Roman';font-size:10.5000pt;mso-font-kerning:1.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}@page{mso-page-border-surround-header:no;mso-page-border-surround-footer:no;}@page Section0{}div.Section0{page:Section0;}Item type: Seawater Salinity MeterCondition: 100% brand newMaterial: plasticColor: As picture shownPackage List:1 x Seawater Salinity MeterNote:It is recommended to fill the water for 12 hours before first use, so that the pointer is easier to get into work.