Data visualization consultants ensure accuracy by thoroughly cleaning and validating data before visualizing it. They implement data governance practices, ensuring the data source is reliable and up-to-date. Consultants collaborate with business stakeholders to understand key metrics and align visualizations with business needs. They apply statistical techniques to verify data consistency and accuracy, preventing misinterpretation. In addition, visualizations are designed to be clear and unbiased, with appropriate context and labeling. By adhering to best practices in data handling, consultants ensure that the insights provided through data visualization consulting services are trustworthy and accurate.