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  1. LEEDS & NORTHRUP - Potentiometer Indicator - 2-range Pot with Galvanometer
    $79.88

    2-range Pot 0-16mV and 16-64mV with Galvanometer, battery (probably corroded if inside) operated in wooden case. Would look beautiful with professional TLC applied to metal, bakelite and wood. Sold As Is.

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  2. Hewlett Packard - 400D - Vacuum tube volt meter.
    $50.00

    Vacuum tube volt meter. (VTVM). A wide-band RMS voltmeter and amplifier. It is capable of reading AC from 1 millivolt full scale to 300 volts full scale. It has wideband response from below 10 hertz to a specified working accuracy limit of 4 Megahertz. As an amplifier, it has a cathode follower output for monitoring, regardless of input switch setting, at about 0.15 volts at 50 ohms impedance.

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