Feature:- -, -This refractometer is designed to measure salinometer measurement tester seawater -Automatic temperature compensation (ATC), your measurements are always accurate regardless of temperature changes -Use only simple calibration steps Soft rubber glasses for comfortable viewing -Filled with soft and comfortable non-slip with rubber handle to keep the test solution from body temperature -Focus and focus adjustment clear scale, large size for easy reading- and long-lasting-Approved by strict quality and safety standardsProduct Parameters:-Type: Photorefractometer-Measuring range: 0-100 (%)-Grid value: 1 (%)-Weight: 300 (g),-Scope of application: seawater salinity meterRange-Salinity: 0 - 100-Brix: 0 - 10%.-Density: 1.000 to 1.070g/cm3. At leastSalinity: 1-Brix: 0.1%-Density: 0.001g/cm3Precision-Salinity: ± 1 ppt-Brix: ± 0.1%-Density: ± 0.001g/cm3-ATC: 10 - 30°c-Reference temperature: 20°cHow to use:-Open the lid and carefully wipe the mirror with a cloth.-Take a few drops of the solution to be tested, place it on the sensing mirror and cover it gently to prevent air bubbles from spreading on the surface of the mirror. Packing List:1 * Refractometer1 * Screwdriver Set1 * With Dropper1 * Regional Aid Guidelines1 * Instructions1 * Storage BoxNotes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.