Check not only for small, dark, oval shaped bugs, but also little black marks (feces) and clear or yellowish bedbug shells. If you find something suspicious, immediately contact the tenant of your temporary home.
Also known as ultraviolet light, black light causes various materials to "fluoresce" or radiate visible light in total darkness. Substances such as bacteria, urine, seminal fluid and blood are detected by black light inspection. Flavin (found in Vitamin B) is also a material that emits a fluorescent glow when exposed to UV light.
Most of them, of course, are connected with bites: Bed bugs' bites are red spots on any part of human body. There are always trails of 2-3 bites in a row, a bed bug doesn't suck all of the blood at once, it feeds on it gradually and bites several times. Itching and redness almost always accompany these insects' bites.
My black light is an LED head torch. As I understand it, these only give out UVA. While you can see bedbug eggs with it, it is also very easy to see other white things like paper and bed sheets, so it doesn't give you any improved contrast.
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These compact, heavy duty flashlights can help you locate and then address otherwise difficult to spot pest issues. Each flashlight contains 9 5 mm LED bulbs, 3 AAA batteries, and a convenient detachable nylon lanyard for ease of use.