Quality Control and Proficiency Samples
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165
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200
results
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SPEX CERTIPREP LLC 3P Hardness QC CRM 250 mL
NSI Lab Solutions QCI-137 Hardness QC CRM, 250mL Single
157
158
159
160
SPEX CERTIPREP LLC 3P Hardness QC 250 mL
NSI Lab Solutions QCI-145 Hardness QC Certified Reference Material, 250 mL; 1/EA
161
162
ERA WATERS CORP PH
One 15 mL screw-cap vial yields up to 1 liter after dilution. Use with nephelometric methods.
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ERA WATERS CORP QC METALS
One 15 mL screw-cap vial yields up to 2 liters after dilution. Use with ICP-OES, ICP-MS and AA methods.