Introduction
The Sofirn SR15 is a high-performance 365nm UV flashlight designed for a wide range of applications, from detecting pet stains and verifying currency to industrial non-destructive testing and mineral exploration. Featuring 4 premium UV LEDs and a specialized filter, it delivers a pure UV beam with minimal visible light interference. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your SR15 UV flashlight.
Product Features
- Powerful 365nm UV Output: Equipped with 4 premium UV LEDs and a filter glass to eliminate purple visible light, providing a pure UV beam for enhanced detection.
- High Irradiance: Delivers 530mW/cm² UV irradiance, suitable for professional non-destructive testing (FPI, MPI).
- Magnetic Tail Cap: Allows for convenient hands-free positioning on ferrous metal surfaces.
- IPX8 Waterproof: Durable aluminum construction ensures reliable performance in challenging environments, resistant to submersion up to 2 meters.
- USB-C Rechargeable: Integrated USB-C charging port for convenient and fast recharging.
- Versatile Applications: Ideal for detecting organic residues, verifying currency, curing UV resin, finding refrigerant leaks, and exploring fluorescent minerals.
- Compact and Robust Design: Made from durable aluminum, designed for everyday carry (EDC) and professional use.

Image: The Sofirn SR15 UV flashlight, highlighting its compact design and key features like USB-C charging and IPX8 waterproofing.

Image: Visual representation of the Sofirn SR15 UV flashlight's diverse uses, including leak detection, industrial NDT, UV resin curing, mineral/fossil identification, hotel sanitation checks, and scorpion hunting.
Package Contents
Upon opening your Sofirn SR15 UV Flashlight package, please ensure all items are present:
- Sofirn SR15 UV Flashlight
- 1 x 21700 Lithium-Ion Battery (pre-installed)
- USB-C Charging Cable
- Pocket Clip (pre-installed)
- Lanyard
- Spare O-rings
- User Manual

Image: The Sofirn SR15 UV flashlight, USB-C cable, lanyard, and spare O-rings laid out next to the product packaging.
Setup
- Initial Battery Preparation: Before first use, unscrew the tail cap and remove the insulating sheet located between the battery and the contact point. This ensures proper electrical connection.
- Battery Insertion: Insert the included 21700 battery with the positive (+) end facing towards the flashlight head.
- Secure the Tail Cap: Screw the tail cap back on tightly to ensure proper contact and maintain the flashlight's waterproof rating.
- Initial Charge: It is recommended to fully charge the flashlight before its first use. Refer to the "Charging" section for detailed instructions.

Image: A visual guide demonstrating the removal of the battery insulation sheet and proper tightening of the flashlight components.
Operating Instructions
- Power On/Off: Double-click the side switch to turn the flashlight ON or OFF. This safety feature prevents accidental activation.
- Battery Status Check: When the flashlight is OFF, a single click of the side switch will activate the battery indicator for 5 seconds.
- Green: 75%-100% battery remaining
- Green Flashing: 50%-75% battery remaining
- Red: 25%-50% battery remaining
- Red Flashing: Less than 25% battery remaining
- Mode: The SR15 UV flashlight operates in a single, high-power UV mode. There are no adjustable brightness levels.

Image: A hand operating the Sofirn SR15 UV flashlight, showing the double-click action for power on/off and the single-click for battery status.

Image: A diagram illustrating the smart power indicators on the Sofirn SR15 UV flashlight, showing different colors for various battery levels.
Charging
The Sofirn SR15 UV flashlight features a convenient built-in USB-C charging port. To charge the device:
- Locate the USB-C port on the side of the flashlight, usually covered by a rubber flap for waterproofing.
- Gently lift the rubber flap to expose the port.
- Connect the provided USB-C cable to the flashlight and plug the other end into a compatible USB power source (e.g., wall adapter, power bank, computer USB port).
- The indicator light on the side switch will show the charging status:
- Red: Charging in progress
- Green: Charging complete
- A full charge typically takes approximately 2.5 hours.
- Once charging is complete, securely close the rubber flap to maintain the flashlight's IPX8 waterproof rating.

Image: The Sofirn SR15 UV flashlight being charged via its USB-C port, with indicator lights showing charging status.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your Sofirn SR15 UV flashlight.
- Cleaning: Wipe the flashlight body with a clean, soft cloth. For the lens, use a lens cleaning cloth to avoid scratches.
- O-rings: Periodically inspect the O-rings for wear and tear. Lubricate them with silicone grease to maintain the waterproof seal. Replace damaged O-rings promptly.
- Threads: Keep the threads clean and lightly lubricated to ensure smooth operation when unscrewing the tail cap.
- Battery Care: If the flashlight will not be used for an extended period, remove the battery to prevent potential leakage. Store the battery in a cool, dry place.
Troubleshooting
If you encounter issues with your Sofirn SR15 UV flashlight, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Flashlight does not turn on. |
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| Light output is weak or flickering. |
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| Water ingress. |
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Specifications
| Feature | Detail |
|---|---|
| Model Number | AUSR15UV |
| Light Source Type | LED (4 x 365nm UV LEDs) |
| UV Irradiance | 530mW/cm² |
| Output Power | 12W |
| Material | Aluminum |
| Water Resistance Level | IPX8 (Water Resistant) |
| Power Source | Battery Powered |
| Battery Type | 21700 Lithium-Ion Polymer (included) |
| Charging | USB-C (approx. 2.5 hours for full charge) |
| Item Dimensions (L x W x H) | 1.57"L x 4.12"W x 1.57"H |
| Item Weight | 0.41 Pounds |
Safety Information
Please read and adhere to the following safety guidelines to prevent injury or damage to the flashlight:
- Eye Protection: Never look directly into the UV light beam. Prolonged exposure to UV light can cause eye damage. Use appropriate UV protective eyewear when operating the flashlight for extended periods.
- Skin Exposure: Avoid direct and prolonged exposure of skin to the UV light.
- Children: Keep the flashlight out of reach of children.
- Heat: The flashlight head may become warm during prolonged use. This is normal.
- Battery Safety: Use only the recommended battery type. Do not attempt to disassemble or short-circuit the battery. Dispose of batteries responsibly.
- Flammable Materials: Do not operate the flashlight near flammable liquids or gases.
Warranty and Support
The Sofirn SR15 UV Flashlight comes with a 2-year warranty from the date of purchase. This warranty covers manufacturing defects and workmanship. For warranty claims, technical support, or any inquiries, please contact Sofirn customer service through the retailer where the product was purchased or visit the official Sofirn website.
Please retain your proof of purchase for warranty validation.
Official Product Video
Video: An official product video from Sofirn showcasing the features and various applications of the SR15 UV flashlight, including its high performance UV filter, USB-C charging, and magnetic base.