Total Dissolved Solids in water: 1 20000 ppm 2.5 In 1 Multi Function Tester One Click Mode Switching Seawater Salinity measurement: Seawater salinity is the ratio of the total dissolved solids to the weight of seawater. It is usually expressed in grams per kilogram of seawater. Measuring range: 10.1 200.0 ppt Key benefits Quick, direct measurement of total dissolved solids in water from 1 to 20000 ppm, enabling fast quality assessment. 2.5 In 1 Multi Function Tester provides multiple measurement capabilities in a single, compact unit, reducing the need for separate instruments. One Click Mode Switching simplifies changing measurement modes, enhancing ease of use and workflow efficiency. Seawater salinity readings are based on the TDS to weight ratio and are expressed in ppt, with a measuring range of 10.1 200.0 ppt, supporting saltwater applications. Designed for clarity and reliability, delivering straightforward readings for informed decision making. Compact and user friendly design supports both field and in lab testing, making it versatile for various setups. Practical applications Aquarium and reef tank maintenance: monitor freshwater TDS levels and seawater salinity to maintain stable water conditions for livestock and corals. Hydroponics and nutrient management: track nutrient solution salinity and TDS to optimize plant growth and prevent nutrient imbalances. Household and outdoor water testing: assess tap water, irrigation water, or other water sources to ensure quality and safety. Performance and compatibility Measures total dissolved solids in water over a broad range (1 20000 ppm) for versatile use across different water types. Seawater salinity measurement expressed as ppt (10.1 200.0 ppt) provides a clear metric for saltwater applications. One Button operation and a compact form factor support convenient, repeatable testing in seasonally varying or on site environments.