PHB
Adventuring Gear
Common
This lens allows a closer look at small objects. It is also useful as a substitute or flint and steel when starting fires. Lighting a fire with a magnifying glass requires light as bright as sunlight to focus, tinder to ignite, and about 5 minutes for the fire to ignite. A magnifying glass grants advantage on any ability check made to appraise or inspect an item that is small or highly detailed.
Cost: 100 gp