Before using a dry suit, divers should perform a __________ check to ensure functionality.

Before using a dry suit, it is essential for divers to perform a visual check to ensure the functionality of the equipment. A visual inspection allows divers to identify any obvious signs of damage or wear, such as tears in the material, issues with the seals, or problems with zippers. By thoroughly examining the suit's exterior and components, divers can confirm that the dry suit is in good condition and will provide the necessary insulation and protection during a dive. This preventative step is crucial for safety, as any unnoticed damage could compromise the suit's effectiveness, potentially leading to water entry and exposure risks during the dive.

Other options, while important in different contexts, may not specifically emphasize the immediate, observable aspects that a visual check targets. Pressure checks or systematic checks could refer to more procedural or technical evaluations, while final checks typically encompass a combination of different checks, not exclusively visual inspection.