Wondrous Item, very rare (requires attunement by a 1 hour in your possession)
The Arcane Investigator's Magnifying glass appears like a traditional handheld magnifying glass, made of copper, glass and polished wood. After holding the item for 1 hour, you become proficient in the Arcana and Investigation skills.
In addition, the magnifying glass can be used to inspect a crime scene, magically revealing events that occurred. The Player may ask the DM one question, limited to the extent of the events that occurred at the crime scene (as per the spell Divination) that the DM must answer. The events play out in the glass of the magnifying glass.
After use, it takes three long rests for the ability to recharge.
Notes: Proficiency: Investigation, Proficiency: Arcana, 1 hour in your possession