The MR-PRO is a powerful, hand-held instrument, aimed at professional applications. Based on the Minirator MR2, it offers, in addition, cable testing, phantom power, balance, impedance and phase measurements and apparent power and phase tests for 70V/100V distributed loudspeaker systems. The output circuitry is balanced, with a lower source impedance and higher maximum level. User waveforms may be loaded via USB into the internal flash memory.It generates pure sinusoidal waveforms with freely-selectable frequencies from 10Hz to 20kHz in 1 digit steps, accuracy 0.01% and a level range from -80 to +18dBu, +/- 0.2 dB. In sweep mode, the start frequency, stop frequency and a step resolution as fine as 1/12th of an octave can be adjusted. Analyzers like the NTI Audio Minilyzer automatically trigger to this signal and record the frequency