How do you choose a vacuum pump is not affected by high humidity?

When selecting a vacuum pump that's unaffected by high humidity, focus on pumps with corrosion-resistant materials, such as stainless steel. Consider oil-free or dry pumps, as they're less susceptible to moisture-related issues. Additionally, look for pumps with proper sealing mechanisms and moisture removal systems to ensure optimal performance in humid environments. Regular maintenance and monitoring of humidity levels are also essential to prolong the pump's lifespan.