General description This 4 in 1 EC TDS Salinity Temperature Test Pen is a versatile digital water quality tester designed for various applications, including measuring the salt content in edible salt, saltwater pools, koi fish ponds, and seawater. It provides accurate and reliable readings for salinity, TDS, EC, and temperature, making it an essential tool for aquarists and water quality enthusiasts. Technical specifications Measurement parameters: Salinity, TDS, EC, Temperature Waterproof rating: IP67 Built-in temperature sensor with automatic temperature compensation (ATC) Data hold function to freeze desired values Compact and lightweight design Other information