Thermal Imaging Devices Thermal imaging devices detect heat in order to locate a target. Thermal imagers are useful for finding targets at night or when visibility is poor due to inclement weather. Here at Optics Warehouse, we supply a range of thermal imaging devices and thermal scopes from leading manufacturers including Guide IR, Pulsar, and Seek Thermal. Finance options are available to customers spending more than £500. Our product experts with more than 35 years of experience in the industry are on hand and ready to help should you have any questions about thermal devices.