In Directorate of Measures and Precious Metals (DMDM) on August 15, 2016 in the Group for Metrology in Chemistry was organized a peer visit organized by a colleague Mr. James Norris from the National Institute of Standards and Technology (NIST), USA. During the visit training was held for a new software version which is used during measurements of the concentration of ozone in the air using the national standard of the Republic of Serbia - photometer for ozone SRP 54. The training was held at the Laboratory for Reference Materials and was attended by employees of the Group for Metrology in Chemistry.