A new twist for UV caches. Use the UV monofilament to create UV reactive digits. The UV monofilament will not be affected by moisture. Use this for kit to create coordinate clues.
Approximately 3m (10ft) of UV reactive monofilament and non-reactive monofilament. Combine UV and non-reactive monofilament in the creation of clues that cannot be detected under white light.
You can even get creative and make shapes or other types of clues using UV monofilament, a Cache At Night exclusive.
Also available as a kit.