Model UT203/204 (hereafter referred to as "the Meter") is 4000-count stable, safe and reliable digital clamp multimeter. They are designed with large-scale integrated circuits and A/D converter as the core as well as the overload protection and novel structure, which make them a superb tool for electricians. The Meter can not only measure AC/DC Voltage, AC/DC Current, Frequency, Duty Cycle, Resistance, Diodes, Continuity but also it has Data Hold, Sleep Mode and Relative Mode features. UT204 has an extra True RMS feature