High accuracy: The 3-in-1 tester combines TDS (Total Dissolved Solids), EC (Electrical Conductivity) and temperature meter for high accuracy with ATC (Automatic Temperature Compensation). Range: 0-9999 ppm, 0-9990s/cm +/- 2%; 0. 1 80 (32-176 ) Quick & easy to use: Just turn TDS meter on, stir water gently, then stabilized readings will be auto locked on LCD in seconds. Our easy to follow instructions make this factory calibrated TDS meter super convenient to use Portable & light weight: measures only 6. 02 x 1. 13 x 0. 49in, 1. 59oz, designed to fit in your pocket and easy to carry Multipurpose: Test drinking water purity to ensure it's healthy, monitor if Reverse osmosis (RO)/DI system works properly, whether filter need replaced, maintenance aquarium, hydroponics (test nutrients), pool and spa, etc. Long lifespan: Long battery life and lower power consumption; Auto-off function saves on battery usage and our TDS meter has lower power consumption than HM TDS meter