These are rulers or L-shaped scales placed next to an object (like a footprint, a weapon, or a bone) to show its exact dimensions in a photograph. Adhesive Scales: Small stickers for vertical surfaces. Folding Scales: Used for larger items or uneven terrain.

Usually numbered or lettered markers (often yellow or white tents) used to identify and sequence different pieces of evidence at a scene.

In forensics, a photo of a piece of evidence is often inadmissible in court if it doesn't include a metric scale, as the size cannot be verified later.