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Eyourlife Salinity Refractometer Salinity Meter Dual Scale Hydrometer Salinity Tester Salt Test Tester Automatic Temperature Compensation Salimeter Measurement Tool for Aquarium Seawater Marine Fishkeeping with Durable Storage Case Use Eyourlife Sailinity Refractometer to measure the salinity fastly and accuratly! Ideal for aquariums and marine monitoring,salty water tank, seafood water tank, salty pools and spas etc. Specifications Measurement On 2 Scales : Specific Gravity (D 20/20) and Parts Per Thousand (‰). Range: Salinity Test : 0 ~ 100 ppt with resolution 1ppt; Specific Gravity (D 20/20) : 1.000 ~ 1.070 with resolution 0.001. Accuracy : +/- 1ppt (0.10%); +/- 0.001 Specific Gravity Features: - Durable Stainless Steel Body. - Automatic Temperature Compensation. - User Friendly Main Prism & Calibration Screw & Obeserving Eyepiece. - Adjust The Focus By Twisting The Handle. How To Use STEP 1: Calibrate to 0 with the screw driver.(The scales of specific gravity and parts per thousand both show 0 ). STEP 2: Place a few drops of the liquid on the optical part of the salinity refractometer. STEP 3: Cover the prism and look through the eyepiece for both Salinity level in PPT and Specific Gravity in D 20/20. Packaging: 1 x Salinity Refractometer 1 pipette 1 x instruction manual 1 x mini screw driver Premium plastic storage case with inner protective tray