Feature: 1. TDS, temperature, numerical value PPM/PPT can be measured at the same time for water quality. 2. There are matte lids and function keys,which is non‑slip and comfortable to hold. 3. Equipped with PPT/PPM conversion button, you can choose the measurement unit according to the actual situation. 4. The water quality tester has a backlight display, easy to read, does not affect its use in the dark. 5. Suitable for measuring drinking water, hydroponics, aquariums, swimming pools, laboratories, etc. Specification: Item Type: Water Quality Tester Material: Plastic Weight: Approx. 447g / 15.8oz Range: Temperature: 0℃~100℃ TDS: low: 0-1999ppm hi: 0 ~19.99PPT Resolution: Temperature: 0.1℃ TDS low: 1PPM hi: 0.01ppt Accuracy: temperature ±0.5°C, TDS: ±2%f.s. Temperature Compensation: 0°C ~ 50°C Working Temperature: 0°C ~ 50°C Battery Voltage: 9V Model: 6f22 Capacity: 1300mah (built-in battery included) Usage Scenarios: suitable for measuring drinking water, hydroponics, aquariums, swimming pools, laboratories, etc. How to Use: 1. Insert the measuring probe into the instrument. 2. Insert the power connector. 3. Put the monitoring head into the liquid to be monitored. 4. The value can be displayed.. Package List: 1 x Water Quality Tester2 x Probe1 x Manual1 x Screwdriver