1High Accuracy: Smart water quality test pen adopts a high accuracy measuring probe with high measurement accuracy. It only needs to insert the probe into the solution to quickly detect. 2Automatic Data Storage: The data of the water test pen can be automatically saved and manually saved, the saved data can be exported to an Excel table, and can also be shared with your friends. 3Value Setting: EC/humidity maximum or minimum limit can be set according to user requirements, if the test result exceeds the setting range, the value will be displayed in red. 4IP67 Waterproof: The water quality test pen with backlight has good water resistance, the waterproof rating is IP67, and it is durable. 5Wide Application: 4 In1 water quality tester can be used for household water, fish tank, swimming pool, laboratory, farmland irrigation, sewage treatment, etc.1 x 4 In1 Water Quality Tester1 x User Manual