1. A mobile dimensioner device, comprising: a display; one or more optical sensors; one or more measurement sensors; an input subsystem; a clock system; one or more processors; and memory containing instructions executable by the one or more processors whereby the device is operable to: receive a threshold time period; activate at least one of the one or more measurement sensors; derive a first set of dimensions for an object and an associated indication of the dimensional accuracy of each of the dimensions based on information received from the one or more measurement sensors; display, on the display, the first set of dimensions and the associated indication of the dimensional accuracy of each of the dimensions; determine the time interval since the first set of dimensions for the object was derived; if the time interval exceeds the threshold time period, receive a deactivation event.