MS3T

EARLY 1960'S ELECTRIC HEATING COMPUTER PANEL METER 0-40KW VS. 0-700 COST - NEW IN BOX - SIZE 3.5"X4.1" - RARE COLLECTIBLE EARLY COMPUTER METER - MADE IN USA - The early Honeywell MS3T panel meters (and the similar MS3 series) were heavy-duty analog instruments used primarily in industrial monitoring, communications, and electronic test equipment throughout the 1960s. Produced by Honeywell's Marion Instrument Division, they were prized for their reliability in high-usage environments.
Specific applications for the MS3T included:
Vacuum Tube Testers: The MS3T movement was a standard component in high-end tube testers (such as those from Wilkinson Electronics), where it monitored plate current and grid voltage to verify the health of radio and television tubes.
Radio and Broadcast Equipment: They were used as percent power gauges and ammeters in large radio transmitters and broadcast consoles to ensure signal output remained within legal and technical limits.
Industrial Control Panels: In factories, MS3T ammeters (typically measuring 0–30 DC Amperes) monitored the electrical load of motors, industrial heaters, and heavy machinery to prevent overloads.
Power Supplies & Battery Chargers: These meters were common on the front panels of commercial-grade DC power supplies to provide real-time voltage and current readings.
Aerospace & Military Gear: Because the "T" in the model name often signified specific ruggedization or terminal styles, they were frequently found in ground support equipment for aviation and in military-spec portable testers