Ultrafire WF-502B 1W UV Flashlight with Clip (3.4V~8V Input)
- High Powered 1W UV LED Emitter
- Glass lens with Aluminum Reflector
- Input Voltage Range: 3.4V~8V (1 x 18650 recommended)
- Can be used for validating watermarks on cash bills or detecting blood traces
- Can also be used to check for dirts on clothing when shopping
There are cheaper less powerful torches available but this one looks the best one!
I bought one to find golf balls :D