1. Introduction
The Proster 2-in-1 Electrical Tester (Model 218A) combines the functionality of an AC Non-Contact Voltage (NCV) Tester and a GFCI Socket Tester into a single, compact device. This tool is designed for electrical work and household circuit testing, providing essential safety and diagnostic capabilities. It features high sensitivity for detecting AC voltage, an ergonomic design for comfortable use, and intelligent indicators for clear feedback.
Please read this manual thoroughly before operation to ensure safe and correct usage.
2. Safety Information
Always adhere to the following safety precautions to prevent personal injury or damage to the tester.
- WARNING: This device detects AC voltage. Do not use it to test DC voltage.
- WARNING: Always test the device on a known live circuit before use to confirm proper operation.
- Do not use the tester if it appears damaged or is not operating correctly.
- Do not operate the tester in wet environments or with wet hands.
- Ensure the battery compartment is securely closed before use.
- Adhere to all local and national safety codes.
- The tester is rated CAT III 600V. Do not exceed this rating.
3. Product Features
- 2-in-1 Design: Combines Non-Contact Voltage (NCV) detection and GFCI Socket testing.
- AC Voltage Detection: Detects 13-300V AC and 50-60Hz.
- GFCI Receptacle Tester: Indicates 6 common wiring errors.
- Visual & Audible Indicators: 360-degree LED visual indicator and audible beep for voltage status.
- Built-in Flashlight: For illumination in dimly lit areas.
- Durable Ergonomic Design: Soft molded rubber handle for comfortable grip.
- Auto Power Off: Conserves battery life.
4. Package Contents
Ensure all items are present and undamaged upon opening the package:
- Proster 2-in-1 Electrical Tester (Model 218A)
- 1 AAA Battery (included)
- User Manual
5. Setup
5.1 Battery Installation
- Twist the battery cap at the rear of the tester counter-clockwise to open.
- Insert the 1 AAA battery, ensuring correct polarity (+/-).
- Replace the battery cap by twisting clockwise until secure.

Description: This image shows the Proster 2-in-1 Electrical Tester with its battery compartment open, illustrating how to insert the AAA battery. The battery cap is visible next to the tester.
6. Operating Instructions
6.1 Power On/Off and Flashlight
- Power On: Press and hold the power button (labeled with a power symbol) for approximately 2 seconds. The device will emit a short beep and the display will illuminate.
- Power Off: Press and hold the power button for approximately 2 seconds. The device will beep and turn off. The device also features an auto power-off function after a period of inactivity.
- Flashlight: Short press the flashlight button (labeled with a flashlight symbol) to turn the built-in LED flashlight on or off.

Description: This image displays the main unit of the Proster 2-in-1 Electrical Tester, showing its ergonomic design and the clearly marked power and flashlight buttons on the side.
6.2 Non-Contact Voltage (NCV) Testing
- Turn on the tester.
- Place the NCV sensor tip near the wire, cable, or electrical outlet you wish to test.
- If AC voltage is detected, the tester will emit an audible beep and the LED indicator will flash red. The intensity of the beeping and flashing indicates the strength of the detected voltage.
- The LCD display will show the detected AC voltage level.

Description: This image demonstrates the non-contact voltage testing feature. The tester's tip is held near an electrical wire, and the device is indicating the presence of voltage with a red light and a digital reading on its screen.
6.3 GFCI Socket Testing
- Turn on the tester.
- Insert the tester's plug into the electrical socket.
- Observe the LED indicators on the tester. The combination of lit LEDs will indicate the wiring status of the socket. Refer to the indicator table below for interpretation.
- To test the GFCI (Ground Fault Circuit Interrupter) function, press the "RCD Test" button on the tester. A properly functioning GFCI outlet should trip (turn off power) when this button is pressed.

Description: This image shows the tester plugged into a wall socket, performing a GFCI test. The device's indicator lights are visible, providing feedback on the socket's wiring condition.
6.3.1 Socket Wiring Indicator Table
| Indicator Pattern | Wiring Status | Description |
|---|---|---|
| Green (Left), Green (Right) | Correct | The line is normal and the electricity is safe. |
| Green (Left), Off (Right) | Ground Open | The shell of household electrical appliances is electrified. |
| Off (Left), Green (Right) | Neutral Open | Unsafe, live wire. |
| Red (Left), Green (Right) | Live/Neutral Reverse | Electrical equipment may quickly age, easy to cause damage. |
| Green (Left), Red (Right) | Live/Ground Reverse | The shell is live and the equipment does not work. |
| Off (Left), Off (Right) | Live Open | Lack of firepower, insecurity. |
| Red (Left), Off (Right) | Live Ground Reverse, Missing Ground | The metal case is electrified. |

Description: This diagram illustrates different LED indicator patterns on the tester when plugged into a socket, corresponding to various wiring conditions such as correct, ground open, neutral open, and live/neutral reverse.
6.4 Live/Null Wire Identification
In NCV mode, insert the test pen tip into the live wire hole of a socket. A strong beeping alarm sound and a screen display indicating "Live Line" will confirm the live wire. When inserted into the null wire hole, the alarm will be weaker or absent, and the screen will display "Zero Line".

Description: This image shows the tester's tip near electrical wiring, demonstrating its ability to distinguish between live and null wires by displaying "Zero Line" on the screen for the neutral wire.
6.5 Breakpoint Testing
Use the NCV function in high-sensitivity mode to detect breaks in insulated wires. Move the NCV tip along the wire; the alarm will cease at the point of the break.

Description: This image illustrates the breakpoint testing feature, showing the tester detecting a break in an electrical cable. The visual cue indicates the location of the discontinuity.
6.6 Video Demonstrations
Proster Rechargeable Smart Multimeter 5.0 Inch Color Screen
Description: This video demonstrates the features and usage of a Proster smart multimeter, including its large color screen and various measurement capabilities. While not the exact 2-in-1 tester, it showcases the brand's interface and general operation for electrical testing.
2 Pack Non-Contact Voltage Detector
Description: This video provides a demonstration of a non-contact voltage detector, showing how to install batteries and use the device to detect live wires and test power strips. It highlights the visual and audible alerts for voltage presence.
7. Maintenance
- Cleaning: Wipe the tester with a dry, clean cloth. Do not use abrasive cleaners or solvents.
- Battery Replacement: Replace the AAA battery when the low battery indicator appears on the display.
- Storage: Store the tester in a cool, dry place away from direct sunlight and extreme temperatures. Remove the battery if the device will not be used for an extended period.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tester does not power on. | Dead or incorrectly installed battery. | Check battery polarity or replace with a new AAA battery. |
| NCV detection is inconsistent or weak. | Low battery, interference from other electrical fields, or thick insulation. | Replace battery. Move away from other electrical devices. Ensure direct contact with insulation if possible. |
| GFCI test does not trip the outlet. | Faulty GFCI outlet or incorrect wiring. | Consult a qualified electrician to inspect the GFCI outlet and wiring. |
| Flashlight does not work. | Low battery or LED malfunction. | Replace battery. If problem persists, contact customer support. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | 218A |
| Brand | PROSTER |
| AC Voltage Range (NCV) | 13V-300V AC |
| Frequency Range | 50-60Hz |
| Safety Rating | CAT III 600V |
| Power Source | 1 x AAA Battery (included) |
| Product Dimensions | 20 x 5.5 x 3.3 cm |
| Item Weight | 100 g |
| Color | Black with Orange accents |
10. Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official PROSTER website. Keep your purchase receipt as proof of purchase.
Manufacturer: Proster Trading Limited





