Thermal ntawv yog ib qho khoom siv dav nyob rau hauv POS cov cav tov uas tuaj yeem tsim cov duab thiab cov ntawv nyeem los ntawm lub taub hau thermal. Txawm li cas los xij, thaum siv cov ntawv thermal, peb yuav tsum tau them sai sai rau qee yam kom ntseeg tau tias qhov ua haujlwm qub thiab luam tawm zoo ntawm lub vev xaib. Ua ntej, them sai sai rau doin ...