DARKBEAM 365 Nm UV Flashlight, 2 pack, filtered black light

Each torch in this 2 pack is 2.2 x 2.2 x 9 cm and 230 g, and the pair runs on a built-in rechargeable battery rather than disposable cells. The DARKBEAM emits 365 nm UV light that is invisible to the naked eye, and the listed uses include checking dog and cat urine, banknotes and jewelry. A charged light runs for 1 h of continuous use.

Does this UV flashlight suit your job?

The light is listed for pet urine detection, so dog and cat owners can use it to show where invisible stains or fluids sit on a floor or on grass. The list also covers counterfeit document, banknote and jewelry identification, UV resin and green oil curing, and glowing UV painting.

One limit comes with the product: do not look directly at the UV light. The 230 g weight and 9 cm length make each torch a pocket-size item that fits a keychain or a pocket.

What the 2 pack includes

• Two DARKBEAM DKL-V4 UV flashlights, each with a built-in rechargeable battery.
• One hand strap.

USB charging and run time

The built-in battery charges directly over USB from an adapter up to 5V/1A, a power bank, a laptop or another USB device. A full charge takes 1 to 2 h, and a charged flashlight then runs for 1 h of continuous use.

Radiant intensity is 1300 mW, and the output measures 365 nm, a wavelength that sits outside human vision. The hard toughened black filter optical lens filters out unwanted visible light, which leaves almost no visible violet light in the beam.

Filtered lens, aluminium case and light output

Items that contain fluorescent agents or anti-counterfeiting codes show up as blue-violet light under the beam, while ordinary surfaces stay dark. That is what makes the flashlight useful for banknotes, documents and jewelry, and for finding pet accidents that are otherwise invisible on a floor or lawn.

The case is made of aluminum alloy, and the compact body is small enough to slip onto a keychain. The hand strap gives another way to keep the light with you between checks.

What should a buyer know before ordering?

How wide is the flashlight and how much does it weigh?

Each unit measures 2.2 x 2.2 x 9 cm (0.9 x 0.9 x 3.5 in) and weighs 230 g (8.1 oz).

How long does the battery last on one charge?

Continuous use runs for 1 h after a full charge, and charging takes 1 to 2 h.

What can I charge it from?

It charges over USB from an adapter up to 5V/1A, a power bank, a laptop or another USB device.

What does the pack contain?

The pack contains two UV flashlights and a hand strap.

What surfaces is it meant for?

It is listed for floors and grass where pet urine may have left invisible stains, and for banknotes, documents and jewelry that carry fluorescent or anti-counterfeiting marks.