Overview
The Brother HD390A is a high-sensitivity, high-precision analog multimeter designed for professionals and hobbyists who prefer the tactile feedback of a mechanical pointer. Unlike digital meters, the HD390A provides instantaneous visual feedback, making it the best tool for detecting intermittent faults, oscillating signals, and checking the “health” of capacitors. Encased in a rugged protective holster, it’s built to survive the tough environment of a repair shop or a student lab.
Key Features
Dynamic Real-Time Monitoring: The mechanical needle reacts instantly to voltage changes, allowing you to see trends and dips that digital meters might smooth over.
10A High Current Range: Dedicated 10A DC range for testing high-power circuits and motors.
Continuity Buzzer: Includes an audible beep for quick wire-tracing and short-circuit testing without looking at the screen.
Transistor & Diode Testing: Features a specialized hFE socket for checking NPN/PNP transistors and a dedicated diode test mode.
Overload Protection: Equipped with dual fast-acting fuses to protect the delicate internal movement from accidental surges.
Technical Specifications
| Feature | Measurement Range |
| DC Voltage | 0.1V / 2.5V / 10V / 50V / 250V / 1000V |
| AC Voltage | 10V / 50V / 250V / 1000V |
| DC Current | 50µA / 2.5mA / 25mA / 250mA / 10A |
| Resistance | x1 / x10 / x100 / x1k / x10k (Up to 20MΩ) |
| Capacitance | 100pF to 25µF (and C2 up to 2000µF) |
| Battery Test | 1.5V & 9V dedicated scales |
| Power Supply | 1 x 9V (6F22) and 2 x 1.5V (AA) |
| Dimensions | 160mm x 105mm x 40mm |


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