Introduction
The Alonefire H42UV is a professional-grade 36W 365nm ultraviolet (UV) torch designed for a wide range of detection and curing applications. This powerful device features a high-intensity UV LED, a specialized black UV filter lens for purer UV output, and a convenient USB rechargeable system. It is constructed from durable aluminum and includes essential accessories such as rechargeable batteries and UV protective glasses for immediate and safe operation.
Safety Information
WARNING: UV Radiation Risk
- Always wear the provided UV protective glasses when operating the torch to prevent eye damage.
- Do not look directly into the UV light source.
- Keep this device out of reach of children.
- Avoid prolonged direct skin exposure to UV light.
- Handle batteries carefully. Ensure correct polarity during installation and avoid short-circuiting.

Image: The Alonefire H42UV UV Torch kit, including the flashlight, yellow UV protective glasses, and a USB charging cable.
Package Contents
Verify that all items are present in your package:
- 1 x Alonefire H42UV 36W 365nm UV Torch
- 1 x USB Charging Cable
- 4 x Rechargeable Lithium-Ion Batteries
- 1 x UV Protective Glasses

Image: A visual representation of the package contents, including the UV torch, batteries, USB cable, and protective glasses.
Product Features
- Professional 36W 365nm UV LED: Provides high intensity and optimal wavelength for various detection tasks.
- Black UV Filter Lens: Equipped with a toughened black filter optical lens that filters out unwanted ambient light, ensuring a purer UV output.
- USB Rechargeable: Features modern USB-C charging technology for convenience.
- 4x Rechargeable Batteries: Includes four Lithium-Ion batteries, eliminating the need for frequent replacements.
- Durable Construction: Made from robust aluminum for long-lasting performance.
- Water Resistant: Designed to withstand splashes and light rain.
- Two Brightness Settings: Offers low and high power modes for different applications.

Image: A detailed view of the torch head, highlighting the 3x 4-core 365nm UV LEDs.

Image: An illustration demonstrating how the black UV filter lens blocks undesired ambient light to produce a purer UV beam.
Setup
Battery Installation
- Unscrew the tail cap of the UV torch.
- Insert the four rechargeable Lithium-Ion batteries into the battery compartment, ensuring correct polarity (positive (+) end towards the head of the torch).
- Screw the tail cap back on securely.
Charging the Torch
- Locate the USB-C charging port on the side of the torch.
- Connect the provided USB-C charging cable to the torch and plug the other end into a compatible USB power source (e.g., computer, wall adapter).
- The charging indicator light will illuminate red while charging.
- Once fully charged, the indicator light will turn green.

Image: The Alonefire H42UV torch being charged via its USB-C port, with visual indicators for charging (red) and fully charged (green) states.

Image: The UV torch connected to a computer via its USB-C cable for convenient charging.
Operating Instructions
- Wear Protective Glasses: Before activating the torch, always put on the provided UV protective glasses.
- Power On/Off: Press the power button once to turn the torch on. Press it again to turn it off.
- Change Brightness Mode: While the torch is on, press the power button repeatedly to cycle between the low and high brightness settings.

Image: A hand holding the Alonefire H42UV UV Torch, demonstrating its ergonomic design and size.
Applications
The Alonefire H42UV UV Torch is suitable for a variety of professional and household applications:
- Pet Urine Detection: Easily identify hidden pet urine stains on carpets, rugs, and other surfaces.
- Currency and Document Authentication: Verify the authenticity of banknotes, passports, and other official documents that feature UV security markings.
- Mineral and Gem Examination: Observe fluorescence in various minerals and gemstones.
- Resin Curing: Accelerate the curing process of UV-sensitive resins.
- Forensic Investigations: Aid in crime scene analysis by revealing latent evidence.
- Leak Detection: Detect leaks in HVAC systems or automotive fluids when used with UV dye.

Image: A collage showcasing diverse uses of the UV torch, such as illuminating pet stains, verifying currency, and revealing fluorescent materials.

Image: The UV torch highlighting a pet urine stain on a carpet, demonstrating its effectiveness as a pet urine detector.
Maintenance
- Cleaning: Wipe the torch body with a soft, damp cloth. Do not use abrasive cleaners or solvents. Keep the lens clean for optimal performance.
- Storage: Store the torch in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries.
- Battery Care: Recharge the batteries regularly to maintain their lifespan. Avoid completely draining the batteries before recharging.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Torch not turning on | Batteries are not installed correctly or are depleted. | Check battery polarity and ensure they are fully charged. |
| Light flickers or is dim | Low battery charge or poor battery contact. | Recharge batteries. Ensure batteries are making firm contact within the compartment. |
| Torch becomes warm during use | Normal operation, especially on high settings. Overheating protection may reduce intensity. | This is normal. If it becomes excessively hot, turn off and allow to cool. |
Specifications
| Feature | Specification |
|---|---|
| Model Number | H42UV |
| Wattage | 36 Watts |
| Wavelength | 365nm |
| Light Source Type | UV LED |
| Material | Aluminium |
| Power Source | Battery Powered |
| Battery Type | 4x Lithium Ion (included) |
| Runtime | Approximately 4 hours |
| Water Resistance Level | Water Resistant |
| Item Weight | 0.7 Kilograms |
| Special Feature | Rechargeable, Black UV Filter Lens |
Warranty and Support
The Alonefire H42UV UV Torch comes with a 2-year manufacturer warranty. For warranty claims, technical support, or further inquiries, please refer to the retailer where the product was purchased or visit the official Alonefire website for contact information.


