1. Introdución
The NJTY T03B is a versatile non-contact voltage tester designed for safe and efficient electrical assessment. It features advanced NCV detection, voice broadcast alerts, dual sensitivity modes, and an integrated LED flashlight, making it an essential tool for identifying live/hot wires, detecting circuit breaks, and troubleshooting electrical issues.

Figure 1: NJTY T03B Non-Contact Voltage Tester
2. Información de seguridade
Always prioritize safety when working with electrical systems. Read and understand all instructions before using this device. Failure to follow safety guidelines may result in electric shock, fire, or personal injury.
- Do not use the tester if it appears damaged or is not operating correctly.
- Asegúrese de que as baterías estean instaladas correctamente antes do uso.
- Always assume circuits are live until tested and confirmed safe.
- Wear appropriate personal protective equipment (PPE) when performing electrical work.
- This device is designed for voltage detection; it is not a substitute for proper lockout/tagfóra procedementos.
3. Configuración
3.1. Instalación da batería
- Localiza a tapa do compartimento da batería na parte traseira do dispositivo.
- Deslice ou solte a tapa para abrir o compartimento.
- Introduza dúas pilas AAA, asegurándose de manter a polaridade correcta (+/-).
- Coloque a tapa do compartimento da batería de forma segura.
3.2. Acendido/apagado
- To power on: Press and hold the power button (usually marked with a power symbol) until the device activates.
- To power off: Press and hold the power button again. The device also features an automatic shutdown after 5 minutes of inactivity to conserve energy.
4. Instrucións de funcionamento
4.1. Axuste da sensibilidade
The T03B offers two sensitivity modes for varied testing environments:
- High Sensitivity (12V-1000V): Suitable for detecting lower voltages or when a broader detection range is needed.
- Low Sensitivity (48V-1000V): Ideal for higher voltage detection or to minimize false positives in noisy electrical environments.
To switch sensitivity: Press the 'H/L' button on the device to toggle between high and low sensitivity modes.

Figure 2: Adjusting Sensitivity on the T03B
4.2. Vol. sen contactotagDetección e (NCV).
The NCV function allows for safe voltage detection without direct contact with conductors.
- Asegúrese de que o dispositivo estea acendido.
- Bring the tip of the tester close to the wire, outlet, or electrical component you wish to test.
- The device will emit an audible alarm and flash its red indicator light if voltage is detected. The voice broadcast feature will announce the presence of voltage.

Figure 3: NCV Detection with Voice Broadcast
4.3. Live/Hot Wire and Neutral Line Identification
The T03B can differentiate between live/hot wires and neutral lines:
- Live/Hot Wire: When detecting a high voltage electric field or live wire, the tester issues a "High voltage electric field, live wire" alert and flashes red.
- Liña neutra: When detecting a low voltage or neutral field, it promptly alerts with a "caution, low voltage field" voice warning and yellow blinking lights.

Figure 4: Identifying a Fire Line

Figure 5: Identifying a Neutral Line
4.4. Wire Breakpoint Finder
This feature helps locate breaks in insulated wires:
- Move the tester along the length of the insulated wire.
- The device will indicate voltage up to the point of the break. The absence of a signal beyond a certain point indicates a break in the wire.

Figure 6: Performing a Wire Breakpoint Test
4.5. Linterna LED
The integrated LED flashlight assists in working in dimly lit areas.
- To activate the flashlight: Press the flashlight button (usually marked with a light bulb symbol).
- To deactivate: Press the flashlight button again.

Figure 7: Using the LED Flashlight
5. Mantemento
5.1. Limpeza
Limpe o dispositivo cun pano seco e limpo. Non empregue produtos de limpeza abrasivos nin disolventes.
5.2. Almacenamento
Store the tester in a cool, dry place away from direct sunlight and extreme temperatures. Remove batteries if storing for extended periods to prevent leakage.
6 Solución de problemas
- O dispositivo non se acende: Comprobe a instalación das baterías e asegúrese de que non estean esgotadas. Substitúaas se é necesario.
- Lecturas inconsistentes: Ensure the sensitivity mode is appropriate for the testing environment. Avoid strong electromagnetic interference.
- Sen emisión de voz: Check if the voice feature is enabled (if applicable) or if the speaker is obstructed.
7. Especificacións
| Característica | Especificación |
|---|---|
| Dimensións do produto | 16.48 x 2.29 x 2.9 cm; 68 g |
| Marca | NJTY |
| Fonte de enerxía | Alimentado por pilas (2 pilas AAA) |
| Estilo | T03B |
| Cor | Vermello |
| Min. Vol. Operativotage | 12 voltios |
| Vol. Máximo Operativotage | 1000 voltios |
| Clasificación de temperatura superior | 50 graos centígrados |
| Tipo de medida | Voltímetro |
8. Garantía e soporte
The NJTY T03B Non-Contact Voltage Tester comes with a Garantía de cinco anos. This warranty covers free returns and exchanges for up to five years from the date of purchase. For support or warranty claims, please contact NJTY customer service.




