A display device of the disclosure is a display device to be mounted on a vehicle, and includes a display panel, a first input unit, a second input unit, a third input unit, and a controller. The first input unit is configured so as to acquire an engine rotation speed. The second input unit is configured so as to acquire a vehicle speed. The third input unit is configured so as to acquire a shift position of a transmission of a vehicle. The controller is configured so that a first image representing the engine rotation speed and one or more second images representing the vehicle speed are combined and a combined image is displayed on the display panel. The controller is configured so that switching of the second images is carried out based on the shift position.

A measurement system 100 includes: a radiation thermometer 1 including an infrared sensor 11 that measures temperature at a certain measurement position in a non-contact way and a light source 13 that emits an instruction light PL toward the measurement position; an image acquisition sensor 33 that acquires a measurement position image containing a temperature measurement position; a detection unit 41 that detects a position where the instruction light PL exists in the measurement position image to determine a position corresponding to the measurement position in the measurement position image; and a measurement result image generating unit 42 that generates a measurement result image RI by superimposing, on the measurement position image, the temperature measurement result and an identification mark that indicates that a position detected by the detection unit 41 is a measurement position of the physical quantity.

A display device of the disclosure is a display device to be mounted on a vehicle, and includes a display panel, a first input unit, a second input unit, a third input unit, and a controller. The first input unit is configured so as to acquire an engine rotation speed. The second input unit is configured so as to acquire a vehicle speed. The third input unit is configured so as to acquire a shift position of a transmission of a vehicle. The controller is configured so that a first image representing the engine rotation speed and one or more second images representing the vehicle speed are combined and a combined image is displayed on the display panel. The controller is configured so that switching of the second images is carried out based on the shift position.