1. A portable apparatus comprising: an attachment interface configured to removably mount the apparatus to multiple visual indicators including a plurality of different gauges of different sizes or different structures; a camera configured to capture images of the multiple visual indicators, each visual indicator having an associated unique identifier and comprising a display configured to present a gauge reading; and a recording device configured to: perform optical character recognition on the captured images received from the camera to identify at least part of the gauge readings presented on the displays of the visual indicators; identify timestamps of the captured images received from the camera; identify the unique identifiers for the visual indicators using an identification reader separate from the camera; associate each of the identified gauge readings and the identified timestamps with one of the visual indicators based on the identification of the unique identifiers; and at least one of store and transmit information including the identified gauge readings, the identified timestamps, and the identified unique identifiers of the visual indicators.