Here we have LED key ring torches with a choice of LED colours; red, blue, green or yellow. The red LED is particularly useful for for reading charts at night without resorting to using a white light source, ideal for astronomers.
At first glance you will find it almost impossible to tell the difference between a genuine or a fake banknote. With this useful UV checker you are able to detect if the note, credit card or stamp is genuine. It detects the special marks made with fluorescent ink, that are normally invisible in ordinary light, and shows them up.