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Easily and accurately measure the salinity of your tank. Simple to use and read. This unit automatically compensates for temperature. Salinity Calibration Fluid Here at Marine Depot, we carry two different versions of refractometers: Ideally, the standard refractometer should be calibrated with a calibration Marine Depot Aquarium Refractometer as it can stress livestock if it becomes too far out of range and corals use the Ph to help build their skeletons.Calibration: Place a few drops of distilled water on the prism and use the screwdriver to adjust the calibration screw untill the reading is"0". Measuring: