ACR Harmonic meters include multiple products,such as ACR220ELH,ACR230ELH,ACR320ELH,ACR330ELH etc.The integrated electric power monitoring meters are developed by ACREL,conforming to IEC standard,synchronized with the international advanced technology. They have many functions such as full-scale three Phase AC electric parameter measurement,multi-rate electric energy metering,four-quadrant electric energy metering, harmonic analysis,electric network quality analysis,remote signaling input,remote control Output,Network Communication function etc.ACR230ELH/ACR330ELH has electric network waveform real time tracking display and SOE Event record function,mainly using for integrated monitoring and power management of electricity quality of electric .