1. Introduction
This manual provides detailed instructions for the safe and effective use of your ALLmeter Pen Type Digital Multimeter, Model B0C4SRMFMD. This device is designed for measuring AC/DC voltage, resistance, diode, and continuity. It also features non-contact voltage (NCV) detection and live wire identification. Please read this manual thoroughly before operation and retain it for future reference.
2. Safety Information
WARNING: Electrical shock hazard. Improper use of this meter can cause injury or death. Follow all safety precautions.
- Always ensure the meter is in good working condition before use. Inspect for any damage to the casing or test leads.
- Do not attempt to measure voltages or currents exceeding the specified maximum limits.
- Exercise extreme caution when working with live circuits. Always assume circuits are live until verified otherwise.
- Wear appropriate personal protective equipment (PPE), such as safety glasses and insulated gloves.
- Do not use the meter in wet environments or if your hands are wet.
- Ensure the battery compartment is securely closed before operation.
- This device is designed for AC voltage detection in NCV mode and cannot measure DC current.
3. Product Overview
Familiarize yourself with the components of your ALLmeter Pen Type Digital Multimeter:

Figure 3.1: Labeled diagram of the ALLmeter Pen Type Digital Multimeter. Key components include the Input COM, Portable pen hook, Select key, HOLD key, N/L/P key, Display LCD, Signal strength indicator, LED light, and Test pen tip.
4. Setup
4.1 Battery Installation
The ALLmeter Pen Type Digital Multimeter requires one AAA battery (included). To install or replace the battery:
- Locate the battery compartment cover, typically at the rear or top of the device.
- Open the cover.
- Insert one AAA battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
The device includes a low-battery indicator on the LCD display to signal when replacement is needed.
5. Operating Instructions
5.1 Power On/Off
Press the 'Select' button to power on the device. The device will automatically power off after 15 minutes of inactivity to conserve battery life.
5.2 Automatic Measurement Function
In automatic mode, the meter intelligently detects the type of measurement (DC/AC voltage or resistance) and displays the value. This simplifies the measurement process by eliminating the need to manually select ranges.

Figure 5.1: Examples of automatic measurement displays for AC voltage, DC voltage, and resistance (Ohm).
5.3 Manual Functions (Electric Field and Live Wire Detection)
Pressing the 'N/L' button cycles through additional functions. Note that in these modes, only AC can be measured, not DC.

Figure 5.2: Displays for Electric Field (EF) and Live Wire (LIVE) detection modes.
- EF (Electric Fields): This mode detects electric fields without requiring a ground wire. Bring the tip close to a wire to detect if it is live.
- LIVE (Live Wire): In this mode, the device functions as an AC detector. Touch the tip to a wire, and it will beep if the wire is live.
5.4 Diode Measurement
To measure a diode:
- Press the 'Select' button repeatedly until the diode symbol appears on the screen.
- Connect the test leads to the diode.

Figure 5.3: Measuring a diode on a circuit board using the multimeter.
5.5 Continuity Test
The continuity test checks for an unbroken path in a circuit. If a continuous path is detected, the meter will emit an audible beep.
5.6 Non-Contact Voltage (NCV) Detection
The NCV feature allows for safe detection of AC voltage without direct contact. The device will indicate the presence of AC voltage within a range of 12V-1000V. In NCV mode, it can only detect alternating current (AC) and cannot measure direct current (DC).

Figure 5.4: Using the NCV function and LED light in a low-light environment.
5.7 Data Hold (HOLD Key)
Press the 'HOLD' button to freeze the current reading on the display. Press it again to release the hold function.
5.8 LED Flashlight
The built-in LED light can be activated to illuminate dimly lit work areas. Refer to the product overview for the location of the LED light.
6. Applications
The ALLmeter Pen Type Digital Multimeter is suitable for various electrical testing scenarios:

Figure 6.1: Examples of multi-function usage, including testing electrical outlets and circuit breaker panels.

Figure 6.2: Testing electrical components within a car engine.
7. Specifications
| Feature | Specification |
|---|---|
| Model | B0C4SRMFMD |
| Display | LCD, 6000 Counts |
| AC/DC Voltage Range | Automatic scanning test (DC/AC 6V, 60V, 600V) |
| Resistance Range | 6kΩ, 60kΩ, 600kΩ, 6MΩ, 60MΩ |
| Non-Contact Voltage (NCV) Detection | 12V-1000V AC |
| Power Source | 1 x AAA Battery (included) |
| Auto Power Off | 15 minutes of inactivity |
| Dimensions | 8.11 x 2.24 x 1.34 inches |
| Weight | 4.23 ounces |
| Color | Black |
8. Maintenance
- Cleaning: Wipe the meter with a dry, soft cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use for extended periods, remove the battery to prevent leakage. Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.
- Battery Replacement: Replace the AAA battery when the low-battery indicator appears on the display.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on | Dead or incorrectly installed battery | Check battery polarity or replace with a new AAA battery. |
| Inaccurate readings | Low battery; incorrect mode selection; environmental interference | Replace battery; ensure correct mode is selected; move away from strong electromagnetic fields. |
| NCV mode not detecting DC | NCV mode is designed for AC only | This is normal operation. The NCV mode only detects alternating current (AC). |
| Display shows 'OL' | Overload or open circuit | The measured value exceeds the range, or there is no connection. Check the circuit or range. |
10. Package Contents
The ALLmeter Pen Type Digital Multimeter package includes:
- ALLmeter Pen Type Digital Multimeter
- 1.5V AAA Battery
- Test Lead

Figure 10.1: The included test lead for various measurements.
11. Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact ALLmeter customer service directly. Contact details are typically available on the manufacturer's official website or product packaging.

