Category II is where a reading becomes defensible, so the two methods that make it defensible are worked with numbers rather than described: determining emissivity on the actual surface, and building an error budget term by term for both a hot high-emissivity target and a cool reflective one.
No severity table is reproduced. The book explains how a criterion is structured and why a programme must adopt one and cite it.
Study material written by Sensemore. It is not accredited training, it is not from any certification body’s question bank, and it confers no certification.