The McKesson OPA Concentration Indicator, a compact and user-friendly bottle containing 50 single-use test strips, is an indispensable tool for monitoring and maintaining optimal hygiene in various settings. Specifically designed for detecting chlorine levels in water, these test strips provide accurate and reliable readings within seconds. Their ease of use and affordability make them ideal for applications such as pools, spas, water treatment facilities, hospitals, laboratories, and the food and beverage industry. By ensuring optimal chlorine levels, the McKesson OPA Concentration Indicator helps prevent over- or under-chlorination, ensuring the safety and well-being of those who use the water. The test strips' compact size allows for easy storage and transportation, while their single-use design eliminates the risk of cross-contamination. Regular use of this indicator promotes water safety, prevents bacterial growth, and simplifies the water testing process, making it an essential component of any water management system.