Keeping marine fishes at home? The old hydrometer doesn't seem to work well? Time to get a refractometer. Don't lose any more fish! Accurately measure the salinity of your saltwater with this salinity measure kit. It comes with ATC (automatic temperate compensation).
Min reading: 1.000
Max reading: 1.070
In the package: 1x protection box, 1x refractometer, 1x cloth, 1x calibration tool
You can calibrate using distilled water. Distilled water should give a reading of 1.000.