Blacklight Flashlight Pen (395nm)

A 395 nm UV flashlight in pen form. Collectors use this wavelength to see what the room lights hide: residue from cleaning, adhesive from repairs, optical brighteners in paper, and ink that does not belong on a note. It is a first-pass tool, not a laboratory, and it belongs in the same pocket as a loupe.

Gold and silver buyers use it on packaging, certificates, and any note that arrives with a coin. Dealers use it at the table. If you only inspect metal in daylight, you are buying on half the evidence.