When safety is a concern and data logging and downloading are required, the new Raytek MX4+ Nonincendive (NI) model thermometer is the product to choose. It has the same great features as the standard MX4+ thermometers with the extra confidence of an approval needed for use in hazardous environments. The MX4+NI thermometer, Factory Mutual approved as a Class I, Division 2 nonincendive device, does not release enough electrical or thermal energy to ignite flammable gases or vapors under normal operational and environmental conditions.