When safety is a concern and data logging and downloading are required, the Fluke 574 Nonincendive (NI) model thermometer is the product to choose. It has the same great features as the standard 574 model thermometers with the extra confidence of a Factory Mutual approval for use in hazardous environments*. The Fluke 574-NI thermometer, does not to release enough electrical or thermal energy to ignite flammable gases or vapors under normal operational and environmental conditions