Termisk kamera
A thermal camera is particularly suitable for
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Securing the perimeter
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Protection against fire
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Monitoring of temperature.
The latest in thermal cameras are bi-spectrum cameras. These are cameras that practically consist of two cameras in one. They have both a visual lens and a thermal lens, and a separate image sensor for each lens. This means that you have both a "normal" visual image and a thermal image. The images can be displayed individually or on top of each other as "picture in picture".
A good all-around bi-spectrum thermal camera: https://ipcam-shop.dk/termisk-kamera-180/hikvision-ds-2td1217-3-pa-termisk-poe-p3321