Description
Universal, soil indicator, thymol blue, M-cresol purple cresol red, phenol red bromo- thymol blue, chlorophenol red, methyl red, bromophenol blue, thymol blue (acid range), phosphate and chlorine, silica, ammonia, iron, oxygen phosphate, zinc, nickel, manganese, lead, arsenic, chromium dissolved oxygen, hazen scale (colour of water) etc. (Cost of each disc.)
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