1、It is used for rapid and professional testing of water quality of PH, EC (conductivity), TDS (Ppm), ORP and temperature. 2、Intelligent self diagnosis function, prompts for measurement beyond the range and incorrect calibration; IP67 water and dust proof. 3、With a large and clear LCD display with backlight, the values ​​can be easily read and accurately calibrated in low light conditions. 4、Suitable for aquarium, aquaculture, soilless culture, swimming pools, hot springs, school laboratories, etc. 5、With automatic shutdown function, the water quality tester will automatically shut down after 5 minutes of inactivity, which is very safe and practical. Item Type: Water Quality Test Pen Model: EZ-9910 Material: ABS Battery: 3 x 1.5V LR44 (Battery Not Included) Uses: Aquariums, aquaculture, soilless culture, swimming pool and hot spring, school laboratory, food or beverage manufacturing, textile printing and dyeing, paper or pulp bleaching, printing, cooling tower, boiler, cleaning or sewage treatment, etc. Basic Parameter: PH: range: 0.00-14.00PH, accuracy: 0.01pH, resolution: ±0.05pH EC: range: 1-19990μS/cm, accuracy: 1μS/cm; 0.1mS/cm, resolution: ±2%F.S TDS: range: 0-9990ppm, accuracy: 1ppm; 0.1ppt, resolution: ±2%F.S Temperature: range: 0-60℃/32-140℉, accuracy: 1℃/℉, resolution: ±0.5℃ ORP: Range: ±1000mV, accuracy: 1mV, resolution: ±2mV Automatic Temperature Compensation: 0-60℃ Automatic Shutdown: automatic shutdown after 5 minutes of no operating 1 x Water Quality Test Pen (Battery Not Included) 3 x PH Powder 1 x Manual