For the European market, ensure the machine carries the CE Marking, indicating compliance with health, safety, and environmental protection standards. For North America, UL or ETL certification for electrical components is vital. Additionally, verify that the manufacturer follows ISO 9001:2015 quality management systems to ensure batch-to-batch consistency. If the machine is used for children's clothing, ensure the resulting buttons meet ASTM F963 or EN 71-3 standards for tension strength to prevent choking hazards.