PA310 is designed for electric power monitoring and load recording for single or three phase systems. It can be directly used in low voltage systems due to its wide range measurement (up to 200A). PA310 can also maintain better than 1% (IEC62053-21) accuracy even under low current condition (< 5A), thus it still can be used in middle to high voltage system. The unique features of PA310 including: Clip-on CT, bi-directional measurement, long time load recording, and standard communication. Its compact size, easy installation, and low cost make PA310 suitable for modern electricity monitoring and load investigation.