1. Introduzione
This manual provides detailed instructions for the safe and effective use of your NJTY Non-Contact Voltage Tester, Model T-03A. This device is designed for non-contact detection of AC voltage, offering a safe method for identifying live wires, checking for circuit breaks, and performing general electrical troubleshooting.

Image 1: NJTY Non-Contact Voltage Tester, Model T-03A. This image shows the overall design of the voltage tester, highlighting its compact and pen-like form factor with a red and black casing, green and red buttons, and an integrated LED flashlight at the tip.
2. Informazioni sulla sicurezza
Always adhere to local safety regulations and practices when working with electricity. This device is designed to enhance safety, but it does not replace proper electrical safety procedures. Failure to follow these instructions may result in electric shock, injury, or death.
- Non utilizzare il tester se appare danneggiato o non funziona correttamente.
- Verify the tester's functionality on a known live circuit before and after each use.
- Indossare sempre dispositivi di protezione individuale (DPI) adeguati, come guanti isolanti e occhiali di sicurezza.
- Non superare il volume specificatotage range (12V-1000V AC or 48V-1000V AC).
- Keep fingers behind the finger guard during operation.
- Avoid direct contact with live conductors. This is a non-contact device.
- Non utilizzare il dispositivo in condizioni di umidità o in atmosfere esplosive.
- The integrated laser pointer should not be aimed directly at eyes or reflective surfaces.
3. Prodotto finitoview
Familiarizza con i componenti del tuo volumetage tester:

Image 2: Diagram illustrating the key components of the NJTY Voltage Tester. Labels include the NCV sensor head (probe), laser pointer, flashlight, signal/indicator lights, high/low signal indicator, power button, sensitivity switch (H/L), lighting/laser switch, and battery cover.
- Sonda (testa del sensore NCV): Rileva AC voltage senza contatto.
- Puntatore laser: Emits a red laser for targeting test points.
- Torcia elettrica: Fornisce illuminazione in condizioni di scarsa illuminazione.
- Signal / Indicator: Visual indication of voltage rilevamento.
- High/Low Signal Indicator: Displays the detected voltage livello.
- Pulsante di accensione: Accende e spegne il dispositivo.
- Sensitivity Switch (H/L): Alterna tra le modalità di sensibilità alta e bassa.
- Lighting / Laser Switch: Activates the flashlight or laser pointer.
- Coperchio della batteria: Access point for battery replacement.
4. Impostazione
4.1 Installazione della batteria
Il NJTY Voltage Tester requires two AAA batteries (included). To install or replace batteries:
- Unscrew the battery cover at the bottom of the tester (refer to Image 2, item 9).
- Inserire due batterie AAA da 1.5 V, assicurandosi della corretta polarità (+/-).
- Richiudere il coperchio della batteria e avvitarlo saldamente.

Immagine 3: Primo piano view of the battery cover at the base of the NJTY Voltage Tester, showing how it can be unscrewed for battery access.
5. Istruzioni per l'uso
5.1 Accensione/spegnimento
- Per accendere, tieni premuto il tasto Pulsante di accensione (refer to Image 2, item 6) until the indicator lights illuminate.
- Per spegnere, tenere premuto il pulsante Pulsante di accensione again. The device will also automatically shut down after five minutes of inactivity to conserve battery life.
5.2 Modalità di sensibilità
The tester features two sensitivity modes for different applications:
- High Sensitivity Mode (12V-1000V AC): Adatto per rilevare volumi inferioritages or for general detection. Press the Sensitivity Switch (H/L) (refer to Image 2, item 7) to select this mode.
- Low Sensitivity Mode (48V-1000V AC): Ideal for detecting higher voltages or when precise localization is needed to avoid false positives from adjacent wires. Press the Sensitivity Switch (H/L) per selezionare questa modalità.

Image 4: Comparison of high and low sensitivity modes. The top row shows high sensitivity (12-1000V) detecting live wire and null wire. The bottom row shows low sensitivity (48-1000V) detecting live wire and null wire, demonstrating how the tester indicates voltage presence with visual and audible alerts.
5.3 Senza contatto voltage (NCV) Rilevamento
Per rilevare il volume CAtage:
- Turn on the tester and select the desired sensitivity mode.
- Posizionare il Probe (NCV Sensor Head) near the conductor, outlet, or device you wish to test.
- Se AC voltage is detected, the tester will emit an audible alarm and the Signal / Indicator lights will illuminate, with the High/Low Signal Indicator showing the relative strength of the detected field.

Immagine 5: Il volumetage tester in use, demonstrating NCV detection on an electrical outlet and a wire. It also shows the buzzer alarm, flashlight illuminating a circuit box, and the laser pointer targeting a ceiling light.
5.4 Test dei punti di interruzione
This feature helps locate breaks in live wires:
- Ensure the wire is live and the tester is in an appropriate sensitivity mode.
- Spostare il Probe (NCV Sensor Head) along the length of the wire.
- Il tester indicherà il volumetage up to the point of the break. The absence of a signal beyond a certain point indicates a break in the circuit.

Image 6: Illustration of breakpoint testing. The tester indicates voltage on one side of a broken wire, and no voltage on the other side, pinpointing the location of the break.
5.5 Torcia elettrica
To activate the integrated LED flashlight for illuminating dark work areas:
- Premere il tasto Lighting / Laser Switch (refer to Image 2, item 8) once.
- Press it again to turn off the flashlight.

Image 7: The integrated LED flashlight of the voltage tester illuminating a dark electrical panel, demonstrating its utility in low-light environments.
5.6 Puntatore laser
To activate the laser pointer for precise targeting:
- Premere e tenere premuto il tasto Lighting / Laser Switch (refer to Image 2, item 8) for a few seconds.
- Release the button to turn off the laser pointer.
- Attenzione: Do not stare into the laser beam or point it at people or animals.

Image 8: A hand holding the voltage tester, using its red laser pointer to indicate a specific button on an electrical control panel, highlighting its precision targeting capability.
6. Manutenzione
- Pulizia: Pulire il dispositivo con un panno asciutto e morbido. Non utilizzare detergenti abrasivi o solventi.
- Magazzinaggio: 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.
- Sostituzione della batteria: Per garantire letture accurate, sostituire tempestivamente le batterie quando compare l'indicatore di batteria scarica.
7. Risoluzione Dei Problemi
| Problema | Possibile causa | Soluzione |
|---|---|---|
| Il tester non si accende. | Batterie scariche o installate in modo errato. | Controllare la polarità delle batterie; sostituire le batterie. |
| No detection on a known live circuit. | Low battery, incorrect sensitivity mode, or device malfunction. | Replace batteries, switch to high sensitivity mode (12V-1000V), or contact customer support. |
| Falsi positivi (rileva voltage dove non esiste). | Modalità ad alta sensibilità in un ambiente elettrico rumoroso. | Switch to low sensitivity mode (48V-1000V). |
8. Specifiche
| Caratteristica | Dettaglio |
|---|---|
| Modello | T-03A |
| Marca | NJTY |
| Volume ACtage Gamma | 12V-1000V (High Sensitivity), 48V-1000V (Low Sensitivity) |
| Frequenza | Frequenza 50/60 Hz |
| Fonte di alimentazione | 2 batterie AAA da 1.5 V |
| Spegnimento automatico | Dopo 5 minuti di inattività |
| Indicatori | Audible alarm, LED indicator lights |
| Caratteristiche aggiuntive | Integrated LED flashlight, Laser pointer, Breakpoint testing |
| Dimensioni del prodotto | 0.1 x 0.1 x 0.1 pollici |
| Peso dell'articolo | 1.8 once |
9. Cosa c'è nella scatola
- 1 x NJTY Voltage Penna tester
- 2 batterie AAA da 1.5 V
- 1 x Manuale in inglese (questo documento)
10. Garanzia e supporto
NJTY provides comprehensive after-sales support for sixty months from the date of purchase. If you encounter any issues with your NJTY Non-Contact Voltage Tester, Model T-03A, please contact our customer service team for assistance. Please refer to your purchase documentation for specific contact details.