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The pictures above are of a Pomona Electronics Model 4000 High Voltage Test Probe and its original styrofoam box. This device is used for measuring ground referenced signals such as the anode voltages for cathode ray tubes (CRTs). This particular device can measure voltages up to 36 kV.
Below is an associated Pomona Product Safety Alert published in the May 1985 Electronic Servicing & Technology magazine.
