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Hewlett-Packard model 333A distortion analyzer. This meter can be used both as an R.M.S. voltmeter or a distortion analyzer. As a voltmeter there are 13 switchable ranges from 0.0003 volts to 300 volts full scale. As a distortion analyzer there are 7 switchable ranges from 0.1%to 100% full scale. The frequency range of the distortion analyzer is 5 Hz to 600 KHz in five switchable ranges. The distortion analyzer can be operated in either the manual or automatic mode. There is a switchable high pass filter for use when the fundamental frequency is greater than 1 KHz.