Konvio Neer TDS meter helps you monitor Total Dissolved Solids in water for health and performance. It can measure input and output TDS for RO/purifiers and filters, using an intelligent detection chip with quick digital readings. After 10 minutes of inactivity it automatically switches off to save battery power. Ideal for drinking water testing, RO/DI systems, aquariums and hydroponics. Includes 1 TDS meter, battery and user manual.