Code: AQ14020This full range specific gravity meter is now even easier to use. It is a scientific instrument that measures the salinity and specific gravity of tropical seawater aquariums. Improved no-wet-hands design Extra wide stabilizer base Accurate to 0.001 Periodical cleaning is recommended to remove deposits that can accumulate on pointer, causing inaccurate readings. Soak hydrometer in mild acid (vinegar) for 30 minutes, then rinse.