Copper & Iron Test Strip Kit measures Copper levels from 0-3.0 ppm and Iron levels from 0-5.0 ppm. The Copper test strip has been improved with a one-dip formula that offers very distinct colors. The one-dip Insta-TEST® Iron test strip formula eliminates the need to pre-treat the sample with a reduction tablet prior to measuring Iron with a test strip. The Iron strip makes the testing process simpler with just one dip of the strip into a pool or spa before matching the reaction to a color chart on the bottle. There are 25 strips packaged per bottle.