Amp Test Automatically Activation: : The digital multimeter tester can automatically activate and identify ac or dc current test function (no need to switch, just plug the test lead into the amp port).Dual Mode Power System: : The smart ammeter has 2 separated power systems, one is rechargeable lithium battery, the other is 2 alkaline batteries, you will never worry about no power problemSmart Mode: : S30 pocket multimeter tester can automatically measure ac/dc voltage, resistance, continuity with the best solution. All of this functions measurement can be done manually as well.Infrared Thermometer: : The smart digital multimeter can also be used as infrared temperature gun. It can show both the real-time and MAX temperature at the same time. Perfect tools for judging whether the wire is loose or not, the laser pointer can be used as a target location point.High Voltage Diode Test: : The digital voltmeter can not only test low voltage diodes, but also can test high voltage diodes, such as rectifier diodes, voltage regulator diodes, light-emitting diodes, the tested voltage is up to 15V.