Get reliable results in 60 seconds for a wide variety of water quality measures. Simply dip the test strip in your water sample, and compare the color reaction to the chart provided. Instructions included. USA made. AquaChek5 provides five tests: total chlorine (0-10 ppm); free chlorine (0-10 ppm); total hardness (0-415 ppm); total alkalinity (0-240 ppm); and pH (6.4-8.8 pH). 50 tests.