The 400A AC/DC TRMS Clamp Meter is a professional digital clamp meter designed for accurate current and voltage measurements in industrial, commercial, and residential applications. It features True RMS measurement technology for precise readings on both sinusoidal and non-sinusoidal waveforms. The device supports AC/DC current up to 400A, AC voltage up to 1000V, and includes functions such as resistance, capacitance, frequency, temperature, continuity, diode testing, and non-contact voltage detection. With built-in VFD (Variable Frequency Drive) mode and overload protection, it is ideal for electrical troubleshooting and maintenance.