Summary

Single L.E.D. with keyring fitting, good quality UV LED, but tiny, it will illuminate a tiny area, you will have to hold it an inch from the object, preferably in very dim light, and you will viewing an area of about 20mm at a time.   

All that said, it does actually work, fine for carefully checking a bank note, not bad for the price...and you can keep it on your keyring. 

 how UV light works and what it will detect (fascinating article!)

 of what you will see with this (and all the other) UV lights.

Technical

Wavelength: 365-370nm

Lamp: single L.E.D.

Size: 1½ inches X 5/8 inch X 3/8 about 1/3 inch thick (35mm X 20mm X 5mm)

Power: two button batteries, size CR2016

Further information

:

• what it is (and fascinating facts)
• different types (and their applications)
• general examples of items lit by UV light

 of what you will see with this (and other) UV lights:

• Paper (banknote, stamp, security marking)
• Uranium glass
• Porcelain repair detection