Marathon MM Series enables users to adjust the focus of measurement targets, either by push-button at the rear of the instrument, or remotely via an RS232/RS485 PC connection, where adjustments can be seen real-time through video. Users can select from either standard fixed-focus sensors or sensors with the variable-focus option, both with a focus range between 8” and 7’ (200 mm and 2.2 m). Close-focus units also are available with fixed optics, enabling targets as small as 0.02” (0.5 mm) to be measured from a distance of 6” (150 mm). All of the infrared sensors provide integrated through-the-lens sighting, plus either laser or video-sighting for correct aiming and target location. The thermometer incorporates an optional live video feed into its data-acquisition and sensor programming software, allowing for active frame capture.