Hetai Tech YT-P721UV 365 380 395 nm UV penlight

Compact UV penlight for targeted inspection

The Hetai Tech YT-P721UV is a 125 mm aluminium penlight that emits at 365 nm, 380 nm and 395 nm. It runs on two AAA cells and weighs 18 g without batteries. The narrow beam is designed for close-range tasks such as glue curing, invisible-ink detection and document verification rather than wide-area illumination.

Step up from single-wavelength lights

A single-wavelength UV torch only reveals a limited range of fluorescence. Adding 365 nm and 380 nm extends detection to currency security features, fingerprint residues and art-forgery markers that 395 nm alone misses. The upgrade is worth it when one tool must cover forensic, authentication and hobbyist checks without carrying multiple lights.

Headroom for small-spot work, not broad floods

The 0.5 W LED comfortably cures small adhesive spots, validates banknotes and highlights pet stains on fabric. It runs out of reach when a user needs to light up a whole room, scan large surfaces at a distance or cure broad areas quickly; those jobs demand a higher-output model such as the B107UV or P72XUV series.