This new OzonAction video series consists of short instructional videos showing how to use and maintain a refrigerant identifier. The videos provide useful guidance on safety and best practice, understanding the difference between different identifier units, testing procedures and identification of results. It is intended for use by Montreal Protocol National Ozone Officers, Customs and Enforcement Officers as well as technicians involved in the servicing and maintenance of refrigeration and air-conditioning systems. The videos were produced by UN Environment OzonAction in collaboration with Neutronics, Inc. and Unicorn B.V.