Dungeon Delver's Pocket Manual (5e Equipment)
From D&D Wiki
A handy manual containing information on useful things to look for while digging through a cave, signs of traps or hidden paths in forts, and herbs and other food sources in the wilderness. This is a relatively condensed guide, however, and only covers basic info regarding to the aforementioned topics. Overall, it will offer the reader advantage on most checks that pertain to investigating a small area. This effect only works if the book is read for 30 minutes over a short rest, and the effect will end after 3 hours.
Cost: 140 sp
Weight: 2 lbs