Which piece of safety equipment is essential to have on hand at a pool?

Lifebuoys or rescue tubes are critical safety equipment for pools because they are designed for emergency situations where a person may be at risk of drowning or struggling in the water. They provide a means of rescue that allows lifeguards or individuals to reach a distressed swimmer safely without putting themselves at risk. Lifebuoys can be thrown to a person in trouble, enabling them to grasp the flotation device and stay afloat until help arrives.

Having this equipment readily available is a vital part of pool safety protocols, as it enhances the capacity to respond promptly to emergencies. Other equipment mentioned, like swimming floats, underwater cameras, and water quality test kits, serve different purposes and do not directly contribute to immediate life-saving efforts. While they are useful in various aspects of pool management and enjoyment, they do not replace the necessity of having readily accessible rescue equipment on hand to ensure swimmer safety.