In which situation should diving instruments be easily readable?

Diving instruments should be easily readable in situations of low light and poor visibility because these conditions significantly hinder a diver's ability to see clearly. When underwater conditions are compromised due to murky waters or limited light, the readability of instruments becomes crucial for safety and effective navigation.

In such scenarios, divers rely heavily on accurate readings from their gauges to monitor depth, air supply, and other vital information. Easy readability ensures that divers can make informed decisions quickly, which is essential for maintaining safety and avoiding potential hazards.

While other factors like currents, freshwater, or diving in the ocean can present their own challenges, they do not inherently affect the visibility of diving instruments in the same way that low light and poor visibility do.