supply of crms with traceablity certificate , fluoride standard solution as f traceable to srm of nist standard, 500ml ( merck / bnd / thermofisher / equivalent ) , nitrate standard standard solution as no3 f traceable to srm of nist standard, 500 ml ( merck / bnd / thermofisher / equivalent ) , ph buffer solution traceable to srm of nist standard for ph 4+ 0.02 at 25oc, 30 x 30 ml ( merck / bnd / thermofisher / equivalent ) , ph buffer solution traceable to srm of nist standard for ph 7+ 0.02 at 25oc , 30 x 30 ml ( merck / bnd / thermofisher / equivalent ) , ph buffer solution traceable to srm of nist standard for ph 9.18+ 0.02 at 25oc , 30 x 30 ml ( merck / bnd / thermofisher / equivalent ) , turbidity 10 ntu calibration standardtraceable to srm of nist standard formazine, crms, 500 ml ( merck / bnd / thermofisher / equivalent ) , turbidity 100 ntu calibration standard traceable to srm of nist standard formazine , crms. 500 ml ( merck / bnd / thermofisher / equivalent ) , turbidity 1000 ntu calibration standard traceable to srm of nist standard formazine, crms , 500 ml ( merck / bnd / thermofisher / equivalent ) , iron standard solution 100 mg / l traceable to srm of nist standard as fe , 500 ml ( merck / bnd / thermofisher / equivalent ) , conductivity standard solution potassium chloride ( nominal 1.41ms / cm ) , 30 x 30 ml ( merck / bnd / thermofisher / equivalent ) , conductivity standard solution potassium chloride ( nominal 0.147 ms / cm ) , 30 x 30 ml ( merck / bnd / thermofisher / equivalent ) , manganese standardsolution 100 mg / l traceable to srm of nist standard as mn , 500 ml ( merck / bnd / thermofisher / equivalent ) , chloride standard solution1000 mg / l as cl traceable to srm of nist standard, 500 ml ( merck / bnd / thermofisher / equivalent ) , sulphate standard solution 1000 mg / l as so4 traceable to srm of nist standard, 500 ml ( merck / bnd / thermofisher / equivalent ) , carbonate ( alkalinity ) standardas caco3traceable to srm of nist standard, 500 ml ( merck / bnd / thermofisher / equivalent ) , calcium standard solution as caco3 traceable to srm of nist standard, 500 ml ( merck / bnd / thermofisher / equivalent ) , colorstandard solution 500 hazen traceable to srm of nist standard . 500 ml ( merck / bnd / thermofisher / equivalent )