Feature -3 In 1 Water Quality Tester: can be used to test TDS, EC and water temperature accurately. -Tds water meter is a professional water level tester with easy operation, fashionable appearance and small volume. -It is very suitable for all water quality testing, water treatment applications, wastewater regulation, aquaculture, hydroponics, laboratory and scientific testing, pool, ecological testing, colloidal silver, water treatment etc. ± 2%. Range:0-5000ppm (TDS), 0-9990 µs/cm(EC), 0.1-80.0°C/ 32.0-176.0°F (Temperature). Data Lock & Auto-off Function - Easy to read and record. Press [HOLD] button then remove from test solution. 5-minute auto shut off. -Widely Applicable: can be used in water purifiers and filters, food (vegetable, fruit) & drink quality monitoring, pools and spas, aquarium, hydroponics. How to use : 1. Please unplug the electrode sleeve before use. 2. Press the switch and put the electrode into the test solution. 3. After the value stabilizes, press the button, then remove it from the test solution to read. 4. After reading, turn off the meter and wipe. Maintenance: Keep the electrodes clean, cover the electrode protective sleeve, and remove the battery if idle time. Specification: EC: 0-9990OUS/CM TDS: 0-5000ppm Celsius: 0.1-80℃, Fahrenheit: 32.0-176℉ Accuracy: 2% Battery: 3V CR2032 button cell (included) Package Included: 2 x Water testing pen (battery included)