This instrument combines multiple functions, including a salinometer, an ORP negative potentiometer, a pH meter, and a TDS water quality tester, for comprehensive and accurate water quality analysis. Our salinometer uses advanced conductivity measurement technology to quickly and accurately measure water salinity. Whether used for marine aquaculture, swimming pool management, or industrial water, it easily adapts to these applications and provides reliable data for water quality management. Our multifunctional ORP negative potentiometer accurately measures the redox potential of water, helping you understand its redox status and providing important reference data for fields such as water treatment and environmental monitoring. Finally, our pH meter uses a high-precision sensor to display the pH value in real time, ensuring accurate data for various applications, allowing you to make appropriate adjustments and management. Finally, our TDS water quality tester measures the total dissolved solids in water, helping you understand the purity of the water and laying a solid foundation for the safety of your drinking water. This seven-in-one water quality tester is compact, easy to use, and portable. Whether for outdoor activities, home use, or professional water quality testing, it meets all your needs.