NALACAL DW5593
NALACAL SV99 365nm UV Flashlight User Manual
Model: DW5593
1. Introduction
Thank you for choosing the NALACAL SV99 365nm UV Flashlight. This compact and powerful ultraviolet light is designed for a wide range of professional and household applications, including pet urine detection, resin curing, mineral inspection, counterfeit money verification, and identifying fluorescent agents. Its pure 365nm UV output, enhanced by a black filter lens, ensures clear and effective results.

Image: The NALACAL SV99 365nm UV Flashlight, showcasing its compact design and included USB-C charging cable.

Image: The SV99 UV flashlight comfortably held in a hand, highlighting its portable and mini size.
2. Package Contents
Please check the package for the following items:
- 1 x NALACAL SV99 365nm UV Flashlight
- 1 x USB-C Charging Cable
- 1 x User Manual (this document)

Image: Contents of the package, including the SV99 UV flashlight and its USB-C charging cable.
3. Specifications
| Feature | Specification |
|---|---|
| Brand | NALACAL |
| Model Number | DW5593 |
| UV Wavelength | 365nm |
| LED Power | 3W (600mW optical power) |
| Material | Aluminum Alloy |
| Charging Port | USB-C |
| Battery | Built-in Rechargeable Battery |
| Special Features | Black Filter Optical Lens, Charging Indicator, IPX5 Water-resistant |
| Item Weight | 40 g |
| Dimensions | 15.2 x 11.7 x 2.9 cm (Package) |
4. Setup
4.1 Charging the Flashlight
Before first use, or when the light output diminishes, charge the flashlight using the provided USB-C cable.
- Locate the USB-C charging port on the side of the flashlight.
- Connect the USB-C end of the cable to the flashlight and the USB-A end to a compatible power source (e.g., power bank, wall charger, laptop, car charger).
- The LED indicator will show red during charging.
- Once fully charged, the LED indicator will turn green. Disconnect the cable.

Image: The SV99 flashlight connected via USB-C for charging, illustrating the red (charging) and green (full) indicator lights.
5. Operating Instructions
5.1 Power On/Off
To turn the flashlight on or off, press the power button located on the side of the flashlight near the charging port.
5.2 Applications
The 365nm UV flashlight is highly versatile. Here are some common uses:
- Pet Urine Detection: Shine the light in suspected areas to reveal dried pet urine stains, which will fluoresce under UV light.
- Resin Curing: Accelerate the curing process of UV-sensitive resins and adhesives.
- Mineral Inspection: Identify fluorescent minerals that glow under 365nm UV light.
- Counterfeit Money Detection: Verify security features on banknotes that are visible only under UV light.
- Fluorescent Agent Detection: Check for fluorescent agents in cosmetics, textiles, or other materials.
- Scorpion and Bed Bug Detection: Scorpions and certain insects fluoresce under UV light, making them easier to spot.

Image: A visual guide to various applications of the UV flashlight, showing its utility in detecting pet fungus, skin abnormalities, fluorescent agents, authenticating items like jade and currency, and identifying issues in crops.

Image: The UV flashlight in use, revealing hidden stains on a bed and floor, demonstrating its effectiveness for household cleaning inspections.
5.3 Black Filter Lens
The SV99 features a toughened black filter optical lens. This lens is designed to block out visible ambient light, ensuring that only the pure 365nm UV light is emitted. This results in clearer and more effective fluorescence, especially in dark environments, by reducing interference from other light sources.

Image: A diagram explaining the function of the black UV filter lens, showing how it filters out ambient light to provide a purer UV illumination.
5.4 365nm vs. 395nm UV Light
The NALACAL SV99 uses a 365nm UV LED, which is considered professional-grade for its pure UV output. Unlike 395nm UV lights, which often emit a noticeable purple visible light, 365nm UV light is less visible to the naked eye and causes objects to fluoresce more brightly and clearly. This makes it superior for applications requiring precise detection and identification, as it minimizes visual distraction and enhances the fluorescence effect.

Image: A comparison demonstrating the superior clarity of fluorescence under 365nm UV light versus 395nm UV light, particularly when inspecting minerals.
6. Maintenance
- Cleaning: Wipe the flashlight body with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the lens is clean for optimal performance.
- Storage: Store the flashlight in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, charge the battery periodically to maintain its health.
- Water Resistance: The flashlight has an IPX5 water-resistant rating, meaning it can withstand splashes and light rain. Do not submerge the flashlight in water.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Flashlight does not turn on. | Battery is depleted. | Charge the flashlight using the USB-C cable. |
| Flashlight does not turn on. | Power button not pressed correctly. | Ensure a firm press on the power button. |
| Light output is weak. | Battery is low. | Recharge the flashlight. |
| Light output is weak. | Lens is dirty. | Clean the lens with a soft, lint-free cloth. |
| Flashlight not charging. | Cable or power source issue. | Try a different USB-C cable or power adapter. Ensure connections are secure. |
8. Warranty and Support
NALACAL products are manufactured to high-quality standards. For any issues or inquiries regarding your SV99 365nm UV Flashlight, please refer to your purchase documentation for warranty details or contact the seller directly for support. Keep your proof of purchase for warranty claims.
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