Pyrotech 's make Multi function meter (MFM) is specifically designed for measuring AC power line parameters, like voltage, current, wattage, energy, var, power factor & frequency etc (over 90 parameters measured). This single unit can replace all the discrete single meters. Besides giving data on RS485/RS232 bus, this also display all parameters on wide size LCD display. MFM can measure total harmonics distortion up to 21st order. Features Over 90 Power & Energy parameter. Modbus (RTU) communication protocol. Time stamped maximum and minimum parameters. Build in RTC (Real time clock). True RMS Conversion. Field programmable PT/CT Ratio.