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This item is a vintage AN/PSM-4D Multimeter, manufactured for the U.S. Navy Bureau of Ships by Electronic Equipment Engineering, Inc. in Dallas, Texas.
* Item Type: Collectible military-grade test equipment.
* Contract: NObsr-87234.
* Features: Housed in a durable, industrial casing with a carrying handle.
* Condition: Appearance suggests a used, vintage item.Equipment Overview
* Model: AN/PSM-4D Multimeter.
* Purpose: A portable, multirange volt-ohm-milliammeter designed for general-purpose electronic and electrical service work.
* Key Features: It is shock-resistant and waterproof, featuring approximately 10 DC voltage ranges, 10 DC current ranges, 9 AC voltage ranges, and 5 ohmmeter ranges.
* Historical Context: Developed during the mid-20th century (manuals for this series date back to at least 1953), it was a standard tool for naval technicians to maintain and troubleshoot shipboard electronic systems.Â
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* RadioNerds
 +3Technical Details
* Measurement Capabilities: It can measure DC current, DC resistance, and AC, DC, and output voltages.
* Included Accessories: Typically, the full unit came with a protective case, test probes (with tips, alligator clips, or telephone plugs), and a high-voltage probe capable of reading up to 5000 VDC.
* Military Nomenclature: The \"AN\" prefix stands for Army-Navy, part of the Joint Electronics Type Designation System (JETDS) used to identify military electronic equipment.
