1、MULTIPLE DATA DISPLAY: Just immerse the electrode in the solution to be tested, the data will be synchronized to the mobile APP and multiple data will be displayed at the same time, which is convenient and fast 2、SET BY YOURSELF: You can set the maximum or minimum value of the measurement by yourself. Set the maximum or minimum limit of PH and EC according to user requirements. If the test result is out of range, the value will be displayed in red 3、WITHOUT FREQUENT OPERATION: There is no need to frequently operate the water quality pen to check the data, very convenient 4、WIDE APPLICATION: Widely used in drinking water, sewage treatment, water purification, fish tank, aquaculture, swimming pool, hydroponics, etc. 5、HIGH SENSITIVITY ELECTRODE HEAD: Adopt high sensitivity glass electrode, which is rustproof and detachable Item Type: Water Quality Tester Material: ABS Battery: 3 x LR44 button battery(not included) Uses: Widely used in aquariums, aquaculture, laboratories, food brewing, water purification, swimming pools, etc. Basic Parameters: Measuring Range: PH: 0.00~14.00; TDS: 0~999ppm 1000~9990ppm 10.1~100.0ppt; EC: 0~9990μs/cm, 10.01~19.99mS/cm; Temperature: 0.1℃~60℃, 32.1℉~140.0℉; Salinity: 0.01-25.00% 0~999ppm 1000~9990ppm 10.1~100.0ppt 1 x Detection Pen 5 x PH Powder(4.0, 6.86, 9.18, 10.01, 7.00) 1 x User Manual