Checking and life-saving apparatus and instruments in the nautical field, namely, anti-intrusion alarm for swimming pools; [ laser or ] ultrasonic fall detector for swimming pools; access control and alarm monitoring safety system for swimming pools; [ laser or ] ultrasonic immersion detector; standardized safety device for swimming pools, namely, immersion alarm system for swimming pools

Electric or electronic sensors for measuring ph, orp (oxidation reduction potential), dissolved oxygen, ozone, conductivity, resistivity, temperature, flow, and turbidity for industrial and environmental use