Volmate Palm Size Ultra-portable Auto Ranging Auto-off Digital Multimeter Voltmeter Ammeter Ohmmeter, Resistance, AC/DC Current Voltage Meter Tester Test AC/DC voltage and current,resistance,capacitance; Check frequency,duty cycle; Test diode,continuity buzzer Featues Data Hold, Relative Measurement, and an easy-to-read large LCD display Auto-ranging scales make electronic measurements much easier and a breeze Automatically enters sleep mode after 30 minutes of inactivity of rotary switch and buttons for saving power Palm size design makes this a very portable multimeter and always handy for use