Smart Mode: : S30 digital multimeter tester can automatically measure ac voltage, dc voltage, resistance and continuity with the best solution. All of this functions measurement can be done manually as well.Infrared Thermometer: : The pocket digital multimeter tester can also be used as infrared temperature gun. It can show both the real-time temperature and MAX temperature at the same time, the laser pointer can be used as a target location point.Amp Test Automatically Activation: : The electrical amp 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 multimeter tester has 2 separated power systems, one is rechargeable lithium battery, the other is 2 alkaline batteries, you will never worry about no power problem.High Voltage Diodes Measurement: : The dc ac ammeter can not only test low voltage diodes, but also can test high voltage diodes, such as rectifier diodes, regulator voltage diodes, light-emitting diodes. The tested voltage is up to 15V.