Tester for soil acidity, alkalinity and humidity

The utility model discloses a tester for soil acidity, alkalinity and humidity, which is composed of a value indicating current meter 1, an electrode sensor 3 and a functional value switching device 2, wherein the electrode sensor 3 is formed by the laminated structure of the copper, the zinc alloy and the aluminium alloy, and the copper, the zinc alloy and the aluminium alloy are mutually insulated; the zinc alloy end 5 of the electrode sensor is connected with a W< 1 > connector of the value indicating current meter, the copper end 4 and the aluminum alloy end 6 of the electrode sensor are connected with a W< 2 > connector of the value indicating current meter through the functional value switching device, and the switching communication is realized. The utility model uses the sensor as a core hardware system, the sensor is in contact with the soil, the redox reaction of the chemical reaction is used, the current meter is driven by the current which is generated by the reaction, and thus the unit data are displayed, no battery or other external power sources are used and the utility model has the function of simultaneously testing the soil acidity and the humidity.