supply of chemical for water testing laboratory at public health engineering subdivision harsud-1 ph buffer solution for 4 ph(crm) iso 17034 certified(bnd) 2 ph buffer solution for 7 ph(crm) iso 17034 certified(bnd) 3 ph buffer solution for 9.2 ph(crm) iso 17034 certified(bnd) 4 turbidity 100ntu(rm) iso 17034 certified 5 calcium standard solution 1000 mg/las caco3 (crm) 6 colour standard solution 500 hazen(crm) 7 conductivity standard solution potassium chloride(nominal 1.41 ms/cm)(rm 8 sodium carbonate(crm) 9 sodiumchloride(crm) 10 total dissolve solid(tds) standard solution potassium chloride calibration standard 1000mg/i(crm)