Features ▲ Harmonic Noise Analysis ▲ Continuous On-Line Help ▲ Harmonic Table: 60Hz or 50Hz (depending on Model) ▲ Direct Access to Filters ▲ "Green Window" Test ▲ Standard Noise Measurement Features ▲ Digital Signal Processing Technology using High Resolution FFT ▲ Spectral Update Time of 7.5 Seconds ▲ 90dB On Screen Display ▲ Harmonic Current Probe Input up to 100 Amps ▲ Peak Finder ▲ Analysis Mode ▲ Weather Resistant ▲ Portable, Durable & Lightweight ▲ Data Logging ▲ Auto Dial (DTMF & Dial Pulse) ▲ Digital Memory ▲ Hardcopy printout (w/ external printer) ▲ Selectable Impedance:      600Ω, 900Ω and Bridged (600Ω or 900Ω) ▲ Filters:      60Hz: C-Message, 3KHz Flat, 20/F      50Hz: Psophometer, 3KHz Flat (C.C.I.T.T.), 1/F, None ▲ Zoom Mode ▲ Geiger Mode ▲ Automatic Shut-Off to conserve battery life