The Heavy Metal Test Kit range includes the following which is within the USA Drinking Water Guidelines.
Lead 0, 5, 15, 30 , 50 (ppb)
Mercury (Hg) 0, 0.002, 0.005, 0.01, 0.02, 0.04, 0.08 (ppm)
Copper 0, 0.05, 0.1, 0.2, 0.4, 1 , 2 (ppm)
Iron 0, 0.3, 0.5, 1, 3, 5 (ppm)