... ADC) be the fundamental principle, sample the voltage and current, which largely improves measured degree of accuracy and stability. ... . Class of accuracy for voltage, current, active power and active electric energy (built-in current transformer): 0.05. 2. Class of ... , 120V, 240V, 480V, automatic gear shift. 4. Current input: built-in current transformer: 1mA~12A, automatic gear shift. Clamp meter: 5A, ...