Yleismittari ALLNET ALL4421

The ALLNET ALL4421 multimeter is a handheld instrument designed for measuring voltage, current and resistance in a range of electrical and electronic circuits. It provides a clear LCD display and automatic range selection to simplify operation, while its compact and lightweight housing supports portability for both professional technicians and home users. The meter is built to withstand regular field use and delivers numerical readings suitable for troubleshooting, component testing and basic electrical verification.

Advantages

The device combines automatic ranging with a readable backlit LCD, reducing the need for manual range changes and improving measurement speed. Its durable casing and ergonomic form factor make it comfortable to hold during extended use. Measurement inputs are arranged for safe connection, and the instrument offers basic protection against overloads in common measurement scenarios. Battery-powered operation enables use in locations without mains power.

Suitable for

• Measuring DC and AC voltage in household and automotive systems
• Testing continuity and resistance of electronic components and wiring
• Measuring small to moderate DC and AC currents for troubleshooting
• Routine electrical checks in workshops, labs and field service

Key specifications

• Measurement functions: voltage (DC/AC), current (DC/AC), resistance, continuity
• Display: clear LCD with backlight for low-light visibility
• Range selection: automatic (auto-ranging)
• Power: battery-powered for portable use
• Form factor: compact, lightweight handheld housing
• Safety features: input protection and overload indicators for common ranges

How to use

Before use, inspect the meter and test leads for visible damage and install a fresh battery if required. Connect the test leads to the appropriate input terminals for the measurement type, select the desired measurement function if necessary, and place the probes on the circuit points to obtain readings on the LCD. For voltage measurements, connect probes in parallel with the circuit under test; for current measurements, place the meter in series. Observe polarity for DC measurements and allow the display to stabilize before recording values.

Recommendations

Use the multimeter within its specified measurement ranges and refer to its safety markings during operation. Replace batteries promptly to avoid inaccurate readings, avoid exposure to moisture and extreme temperatures, and store the instrument in a protective case when not in use. For work on mains-voltage circuits or where high currents are present, follow applicable safety procedures and use personal protective equipment.