1. Introduction
The KAIWEETS HT106D Socket Tester is designed to quickly and accurately detect common wiring faults in standard electrical sockets and RCD (Residual Current Device) protected circuits. It features a clear LED display for voltage measurement and intuitive LED indicators for wiring status. This manual provides essential information for the safe and effective use of your device.
2. Safety Information
Please read all safety warnings and instructions carefully before using this product. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- This device is rated CAT II 300V. Do not use it for measurements exceeding this rating.
- Do not use the tester if it appears damaged or is not functioning correctly.
- Do not use the tester in wet conditions or with wet hands.
- Always ensure the socket is de-energized before performing any wiring work. This tester is for verification only.
- The RCD test function may trip the circuit breaker. Ensure all sensitive equipment is saved or turned off before performing an RCD test.
- Important Note for 3x230V installations without neutral (common in Belgium): This tester may not function correctly or provide accurate readings in 3x230V installations without a neutral wire. It is primarily designed for systems with a neutral connection.
- Keep out of reach of children.
3. Product Overview
The KAIWEETS HT106D Socket Tester is a compact and robust device designed for ease of use. It features a digital display for voltage and a series of LED indicators to show wiring status.

Figure 1: Front view of the KAIWEETS HT106D Socket Tester, showing the digital voltage display, LED indicators, and RCD test button.
3.1 Components
- Plug Pins: For insertion into the electrical socket.
- LED Indicators: Red LEDs that illuminate in various patterns to indicate wiring status.
- Digital Display: Shows the measured voltage.
- RCD Test Button: Initiates the RCD trip test.
- Wiring Status Chart: Printed on the device for quick reference.

Figure 2: Diagram illustrating the dimensions of the KAIWEETS HT106D European standard plug.
4. Setup
The KAIWEETS HT106D Socket Tester comes with 2 AAA batteries included and pre-installed. No initial setup is required beyond ensuring the batteries are correctly seated if the device does not power on.
4.1 Battery Installation/Replacement
If battery replacement is needed, carefully open the battery compartment, insert 2 AAA batteries observing polarity, and close the compartment securely.

Figure 3: Rear view of the KAIWEETS HT106D Socket Tester, showing the battery compartment location.
5. Operating Instructions
The HT106D is designed for simple plug-and-play operation. Once plugged into a live socket, it automatically performs a wiring check and displays the voltage.
5.1 Basic Wiring Test
- Insert the KAIWEETS HT106D Socket Tester into the socket you wish to test.
- Observe the LED indicators on the front panel. The pattern of illuminated red LEDs will correspond to a specific wiring condition.
- Refer to the wiring status chart printed on the device or in Section 5.4 of this manual to interpret the results.

Figure 4: Visual representation of the 7 circuit conditions detected by the HT106D, with corresponding LED patterns.
5.2 Voltage Measurement
Upon insertion into a live socket, the digital display on the HT106D will automatically show the measured voltage of the socket. This provides an immediate reading of the electrical supply.

Figure 5: Close-up view of the digital display showing the measured voltage.
5.3 RCD Test
The RCD test function verifies the operation of Residual Current Devices (RCDs) by simulating an earth fault condition. This test should only be performed on RCD-protected circuits.
- Plug the HT106D into an RCD-protected socket.
- Ensure the wiring status indicates 'Correct' before proceeding.
- Press the RCD Test Button (located at the bottom of the device).
- If the RCD is functioning correctly, it should trip, cutting power to the circuit. The tester's lights will go out.
- If the RCD does not trip, it indicates a potential fault with the RCD device, and further investigation by a qualified electrician is recommended.
- To restore power, reset the RCD at your consumer unit.
Caution: Performing an RCD test will temporarily cut power to the circuit. Save any unsaved work on computers or other electronic devices before initiating the test.

Figure 6: The KAIWEETS HT106D plugged into a socket, ready for or performing an RCD test.
5.4 Understanding LED Indicators
The HT106D uses a combination of three red LEDs to indicate the wiring status. Refer to the table below for interpretation:
| LED Pattern | Wiring Condition | Description |
|---|---|---|
| ● ● ● (All three LEDs ON) | Correct | The wiring is correct. |
| ● ○ ○ (Left LED ON) | Open Ground | The earth wire is not connected. |
| ○ ● ○ (Middle LED ON) | Open Neutral | The neutral wire is not connected. |
| ○ ○ ● (Right LED ON) | Open Live | The live wire is not connected. |
| ● ● ○ (Left & Middle LEDs ON) | Live/Ground Reverse | The live and earth wires are reversed. |
| ○ ● ● (Middle & Right LEDs ON) | Live/Neutral Reverse | The live and neutral wires are reversed. |
| ● ○ ● (Left & Right LEDs ON) | Live/Ground Reverse, Missing Ground | The live and earth wires are reversed, and the earth connection is missing. |
Note: '●' indicates an illuminated LED, '○' indicates an unlit LED.
6. Specifications
| Feature | Specification |
|---|---|
| Model | HT106D |
| Operating Voltage Range | 48V - 250V AC |
| Frequency Range | 50Hz - 60Hz |
| RCD Test Current | >30mA |
| Safety Rating | CAT II 300V, CE |
| Power Source | 2 x AAA Batteries (included) |
| Dimensions | Approximately 7.9 x 7.5 x 7.5 cm |
| Weight | Approximately 80 grams |
| Plug Type | European Standard 2-pin |
| Color | White |
7. Maintenance
- Cleaning: Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the tester in a cool, dry place, away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries to prevent leakage.
- Inspection: Periodically inspect the device for any signs of damage, such as cracks in the casing or bent pins. Do not use if damaged.
8. Troubleshooting
- Device does not power on: Check if the batteries are correctly installed and have sufficient charge. Replace batteries if necessary.
- No LED indication or voltage display: Ensure the socket is live and functioning. Test with a known working socket. If still no indication, the device may be faulty.
- RCD test does not trip the circuit: Ensure the socket is RCD-protected. If it is, and the RCD does not trip, the RCD itself may be faulty and requires inspection by a qualified electrician.
- Inaccurate voltage reading: Ensure the tester is fully inserted into the socket. If the reading is consistently off, compare with another calibrated voltage meter.
9. Warranty and Support
KAIWEETS offers a 36-month service and technical support for the HT106D Socket Tester. If you encounter any issues or require assistance, please contact KAIWEETS customer support through their official website or the retailer where the product was purchased.
For technical support or warranty claims, please have your model number (HT106D) and proof of purchase ready.





