Certified Pool Operator Practice Test 2025 – Comprehensive Exam Prep

When performing a color matching water test using the comparator, the best way to hold the sample is at eye level to a white background. This allows for the most accurate comparison of colors. Holding the sample next to a natural light source (option B) may cause shadows or glare, affecting the color perception. Holding the sample up to the horizon opposite the sun or a daylight illuminator (option C) may also create a biased perception of color due to the lighting conditions. Holding the sample in direct sunlight (option D) can also create glare and inaccurate color perception. Therefore, holding the sample at eye level to a white background is the most effective and accurate method for performing a color matching water test using the comparator.