An electronic device displays an application user interface that includes a representation of a field of view of one or more cameras. The representation of the field of view is updated over time based on changes to current visual data detected by the one or more cameras, and the field of view includes a physical object in a three-dimensional space. While the device is a first distance from the physical object, the device displays a representation of a measurement that corresponds to the physical object, and one or more first scale markers along the representation of the measurement at a first scale. After the device has moved to a second distance from the physical object, the device displays, at a second scale that is different from the first scale, one or more second scale markers along at least a portion of the representation of the measurement.