The hydrometer function will test the salinity levels in marine aquariums and the thermometer will test the temperature of the water. This Hydrometer/Thermometer is easy to read and use.
Green color indicates both ideal temperature and salinity.
Hydrometer measures specific gravity: 1.000—1.060
Temperature in °F (40-120) and °C.(0-50)
Ideal water parameters:
Marine 22-26C
Salinity 1.020-1.024