How to Use: 1. Connect AC power (make sure it is correct) 2. Connect to the appropriate electrode socket. 3. Remove the protective cover, rinse the electrode with distilled water, put the pH electrode into the liquid to be tested, and stir gently. Wait until the numbers are stable and read the final value. Specification: Item Type: Digital Water Quality Meter Material: ABS Product Size: Approx. 16 x 11.5 x 4cm / 6.3 x 4.5 x 1.6in Range: PH: 0.00-14.00PH Tds: 0-19990ppm 0-199.0ppt Temperature 0-50℃(32-122℉ ) Resolution: PH: 0.01PH Tds: 1ppm ( 1000ppm) 0.1ppt Temperature: 0.1℃(0.2℉) Alarm Setting Range: Tds 0-20000ppm Features: with Wifi, App Function Application: Suitable for Water Source, Soilless Culture, Aquarium, Laboratory, Hot Spring, Environmental Water, Swimming Pool, Water Purification System, Etc. Weight: Approx. 1075g / 37.9oz Package List: 1 x Digital Water Quality Meter 1 x Connecting Line 1 x Electrode 10 x Accessories 1 x User Manual