Yes, if the blood stains show a brown fluorescence color under ultraviolet light, it can be judged that there should be blood stains.

How do you get 2 AA batteries in it?

It was powered by 2*AAA batteries.

Can this test uv blocking of sunglasses?

The wavelengths range of the ultraviolet light in the sunlight is 10nm-400nm, this blacklight flashlight is 395nm. You can only use this blacklight fashlight to test if your sunglasses can block 395nm blacklight, for other wavelengths light of UV light, you need other lights.

Has anyone used these to detect Freon leaks ? Do they work for that

Yes, it can detects Freon leaks.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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COSOOS 2 UV Black Light Flashlight, 2 Pack 395nm Mini Pen Light with Clip, Waterproof Ultraviolet Flashlight for Leak, Pet Urine, Scorpion, Hotel Inspection, Dry Stain and Bed Bug.

COSOOS 2 UV Black Light Flashlight, 2 Pack 395nm Mini Pen Light with Clip, Waterproof Ultraviolet Flashlight for Leak, Pet Urine, Scorpion, Hotel Inspection, Dry Stain and Bed Bug.

Product ID: 475927900

Details

Color
Black
Light Source Type
LED
Material
Metal
Power Source
Battery
Special Feature
Lightweight

💧IPX4 waterproof - splash resistant

📏Compact 5.5in pen size - ultra portable

🔦395nm UV wavelength - unseen detection

฿1153

Duties & taxes included

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔦 Unlock the unseen world with COSOOS UV Black Light – Because what you don’t see can’t hide!

CLIP GO CONVENIENCE - Lightweight metal clip design lets you attach it anywhere—belt, pocket, or bag—for hands-free efficiency.
SIMPLE NO FUSS OPERATION - One-button on/off makes it effortless to use anytime, anywhere—no complicated setup required.
RAIN OR SHINE READY TO SHINE - IPX4 water resistance means reliable performance in wet or emergency conditions without missing a beat.
INVISIBLE INSIGHTS VISIBLE RESULTS - 395nm UV light reveals stains, scorpions, and counterfeit IDs invisible to the naked eye.
DOUBLE THE POWER DOUBLE THE DETECTION - Two pen lights in one pack ensure you never run out of UV coverage, perfect for home, travel, or professional use.

The COSOOS 2 Pack UV Black Light Flashlights feature a powerful 395nm wavelength LED that detects pet stains, counterfeit IDs, scorpions, and more. Compact and lightweight at just 1.1oz each, these pen lights come with removable metal clips for easy portability. Built with durable alloy and IPX4 splash resistance, they perform reliably indoors and outdoors. Powered by 2 AAA batteries each (not included), this set is perfect for professionals and pet owners seeking quick, hands-free UV detection.

Specifications

ASIN	B0B92PDCSV
Additional Features	Lightweight
Batteries are Included	No
Battery Description	Alkaline
Battery Type	Alkaline
Best Sellers Rank	#1,952 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Pet Urine Detectors #32 in Handheld Flashlights
Brand Name	COSOOS
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,236)
Finish Types	Smooth Metal
Included Components	2*uv pen light
Item Dimensions D x W x H	5.5"D x 1.1"W x 0.8"H
Item Type Name	2 pack uv pen light
Item Weight	1.1 Ounces
Light Source Special Features	395nm wavelength detection
Light Source Type	LED
Manufacturer	COSOOS
Manufacturer Part Number	FTY67HFHKJFH55
Material Type	Metal
Model Number	CS-DZ002-B
Mounting Type	Clip-on Mount
Number of Batteries	2 AAA batteries required.
Number of Light Sources	2
Power Source	Battery Powered
Recommended Uses For Product	Pet urine detection, Dry stain identification, Scorpion finding, Fluorescent agent identification, Bathroom and hotel room inspection, Counterfeit currency and fake ID detection, Precious minerals, rocks, or jewelry identification
Set Name	2
Shape	Pen
Size	2 Pack
Style Name	Compact
Unit Count	2.0 Count
Voltage	3 Volts
Water Resistance Level	Water Resistant
White Brightness	50 Lumens

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