The LMV series of average responding rms reading ac millivoltmeters are applicable to a wide range of general purpose single or dual channel measurements.
Both models feature a high sensitivity of 100 �V and range to 300 V rms maximum full scale with a wide bandwidth of 5 Hz to 1 MHz for the LMV-181A or to 500 kHz for the LMV-186A. Meter scales are conveniently calibrated in millivolts and dB (0 dBV = 1 V and 0 dBm = 0.775 V) with accuracies to within � 2% f.s.
The LMV-186A has concentric dual channel meter movements with separate needles on the analog display and a channel reverse switch.

For stereo audio, the LMV-186A is very apt for measuring record and playback levels, channel separation, balance and tracking tests of volume, loudness and tone controls versus frequency, etc. The flat bandwidth of the amplifier output terminals on both models often permit them to be used as sensitive, accurate instrument preamplifiers. Other areas of use include test and repair for communications, IF and  ultrasonic circuits and systems.