Low-Level Chlorine Test Strips measure residual chlorine from 0-10ppm in increments of 0-0.5-1-3-5-10 in just seconds. This test strip detects residual levels of free chlorine. It is accurate within 5-10% of reading the colour scale.
NOTE: The Low-Level Chlorine Test Strips are sensitive to humidity and light. Store in a dark and dry area.