Scroll of Film
Unlike normal scrolls, a scroll of film has multiple uses. Each use requires you to pull out a perforated length of the scroll from its leather case. When found the scroll has 1d6 + 4 lengths.
The scroll is partially transparent at its center with gilded edges. While holding a length of the scroll taut out in front of you, you can use an action to speak its command word to cause the transparent portion of the scroll to become opaque. When it does, it records the two-dimensional image of what was seen at that time through the scroll's center on your side of the now opaque paper. The recorded image can be in black and white or color (your choice).
The thieves tore down the moonlit street, away from the veteran guard and shaken recruit. The older guard, a somewhat haggard human, made no pursuit as he lazily tore off a length of scroll from a canister at his side. As he did, the young recruit blurted out, "Sir, sir! Why aren't we in pursuit?" The veteran spoke a single word, as if in conversation with the scroll he was holding, and turned to reveal a perfect image of the gang. "With one word, we now know their height, build, and haul with certainty: everything they'd rather keep hidden. Fighting criminals with swords and shields is for you younger folk. For me, this is plenty. Don't worry, you'll get to chase these guys down tomorrow, after we have the warrants for it."