Thermal imagers, thermal cameras, and temperature guns capture heat emitted by objects. Infrared cameras, or thermal imaging cameras, form images using infrared radiation. Thermal cameras help indicate the need for maintenance, repairs, or replacement. Infrared cameras for smartphones offer an economical and streamlined camera when a smaller, more convenient imager is needed. Infrared thermometers and infrared visual thermometers are temperature guns that find hot and cold spots for troubleshooting. Fixed location infrared thermometers provide continuous monitoring to prevent unplanned outages, service interruptions, and equipment failure. Infrared thermometer calibrators, also known as black box calibrators, are used to calibrate infrared thermometers and imagers. Infrared windows allow thermal cameras to be used to monitor and inspect energized equipment through the window without exposing individuals to potential hazards.