The CellaTemp® PA 36 is a digital pyrometer with fibre optics for measuring temperatures between 650 and 3000 °C. The pyrometer is equipped with a separate pyrometer head. The pyrometer is equipped with a separate optical measuring head and a light guide. The light guide and measuring head are insensitive to interference from electromagnetic radiation and can be used in ambient temperatures up to 250 °C without cooling. The variant with a separate optical measuring head is particularly advantageous in confined spaces.