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Wave Analyzer, a selective voltmeter by Radiomiter-Copenhagen for the acoustic band. It operates in the 20Hz to 20kHz band and has a switchable input filter with 3 characteristics. It could measure signals up to -90dBm. It was built on electron tubes and required annealing and calibration before measurements. Calibration instructions and input filter characteristics are shown on the front of the instrument. The device can be operated by right- and left-handed persons. The frequency shift knob, shown in the photo on the right, easily moves to the left side of the housing.
I haven’t found much about this device, it appeared in Poland around 1960, but the official history of Radiomiter-Copenhagen does not mention this device. Some data can only be found at radiomuseum.org. Currently, the company produces medical equipment, but also dealt with other devices. It should be added that the Fra 2b was the best selective voltmeter that I have ever been able to measure.
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