Salt: salinity seawater is total dissolved solids ratio by weight of sea salt, usually expressed in grams / kilogram water. (Measuring range 10.1-200.0ppt).
Light salt: salt content of less than 0.5g / L of the light water (measuring range: 0.00-25.00% Accuracy: 0.01-5.00% 5.10-25.00%).
Waterproof grade: TP67 (fell into the fish tank can still be used)