supply of camical and glassware for district water testing laboratory agar malwa-ph buffer standard solution ph 4 , traceable to srm from nist , ( with certificate ) make- bnd / merck / thermofisher , ph buffer standard solution ph 7, traceable to srm from nist , ( with certificate ) make bnd / merck / thermofisher , ph buffer standard solution ph 9.0 / 9.2, traceable to srm from nist, ( with certificate ) make bnd / merck / thermofisher, alkalinity standard / sodium carbonate 0.1 n traceable to srm ffom nist., ( with certificate ) make bnd / merck / thermofisher or equivalent any iso-17034 certified make , calcium standard 1000 mg / l traceable to srm from nist., ( with certificate ) make bnd / merck / thermofisher orequivalent any iso-17034 certified make , calcium carbonate standard 1000 mg / l traceable to srm from nist., ( with certificate ) make bnd / merck / thermofisher orequivalent any iso-17034 certified make, chloride standard 500 mg / l traceable to srm from nist., ( with certificate ) make bnd / merck / thermofisher or equivalent any iso17034 certified make, a optimum results reference electrode filling solution, ( with certificate ) make - thermo scientific orion 900061 or equivalent any iso-17034 certified make, tisab iii concentrate with cdta total ionic strenght adjestment buffer , ( with certificate ) , fluoride standard 100 ppm , ( with certificate ) make- thermo scientific orion 940907 or equivalent, turbidity standard solution 400 ntu / 1000 ntu, traceable to srm ffom nist., ( with certificate ) make merck / bnd / thermofisher or equivalent any iso-17034 certified make, conductivity standard 1410 micro mho, traceable to srm ffom nist., ( with certificate ) make merck / bnd / thermofisher or equivalent any iso-17034 certified make, etc