Why is emissivity important for pyrometers?

Emissivity is a material’s ability to emit thermal radiation relative to an ideal black body. For accurate temperature readings, the pyrometer's emissivity setting must match the material being measured. For example, metals, ceramics, and glass have different emissivity values. Adjusting for emissivity ensures precise measurements, especially in industries like metallurgy and manufacturing, where temperature control is critical for product quality and process efficiency.