1No Need to Change Gears: Intelligently identify each gear, automatically switch gears, and work more efficiently. 2Intelligent Anti Burning Design: The non shifting design makes the chance of misuse to cause the watch to burn out. 3Unique Appearance Design: Exquisite craftsman, with temperature probe and meter pen, easy to operate and convenient to use. 4Functions: AC and DC voltage, AC and DC current, resistance, capacitance, frequency, temperature, on off buzzer, NCV, zero live wire discrimination, data retention. 5High Accurate Measurement: 4000 words display digital multimeter; millimeter level accuracy, multiple quick measurement functions. Item Type: Digital Multimeter Model: ZT-S4 Material: ABS + Rubber Battery: 2 x 1.5V AAA Battery(Not Included) Purpose: AC and DC voltage, AC and DC current, resistance, capacitance, frequency, temperature, on-off buzzer, NCV, zero live wire discrimination, data retention. Basic Parameters: DC Voltage (V): 4V/40V/400V/600V AC Voltage (V): 4V/40V/400V/600V AC (mA): 999.9mA AC (A): 9.999A DC (mA): 999.9mA DC (A): 9.999A Resistance: 4k/40k/400k/4M/40M Capacitance: 4nF/40nF/400nF/4F/40F/400F/4mF 1 x Digital Multimeter 2 x Test Lead 1 x Temperature Probe 1 x Manual 1. Enter voltage measurement, short press this key to switch between AC and DC voltage. At this time, in AC voltage measurement mode, the secondary display will display frequency; in DC voltage measurement mode, the secondary display will display room temperature.2. Touch the correct test point on the circuit with the test lead probe.3. Read the voltage value displayed on the display.