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Proficiency Testing

We offer Proficiency Testing products for a variety of testing schemes for both quantitative and qualitative test performance.
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721 Items found

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Fluoride Drinking Water Inorganic Standard Fluoride Drinking Water Inorganic Standard
SKU: PEI-193

Fluoride Drinking Water Inorganic Standard

  • CCL
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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
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Dissolved Oxygen Wastewater PT Standard (2 pack) Dissolved Oxygen Wastewater PT Standard (2 pack)
SKU: PEI-192

Dissolved Oxygen Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
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Ignitability Wastewater PT Standard, 110 mL bottle Ignitability Wastewater PT Standard, 110 mL bottle
SKU: PEI-191

Ignitability Wastewater PT Standard, 110 mL bottle

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
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Uranium Wastewater PT Standard (2 pack) Uranium Wastewater PT Standard (2 pack)
SKU: PEI-180

Uranium Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
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Perchlorate Wastewater PT Standard (2 pack) Perchlorate Wastewater PT Standard (2 pack)
SKU: PEI-146

Perchlorate Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
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Hardness Drinking Water Inorganic Standard Hardness Drinking Water Inorganic Standard
SKU: PEI-145

Hardness Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
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Vanadium Drinking Water Inorganic Standard Vanadium Drinking Water Inorganic Standard
SKU: PEI-144

Vanadium Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
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Uranium Drinking Water Inorganic Standard Uranium Drinking Water Inorganic Standard
SKU: PEI-143

Uranium Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
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Corrosivity Drinking Water Inorganic Standard Corrosivity Drinking Water Inorganic Standard
SKU: PEI-142

Corrosivity Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
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Orthophosphate Drinking Water Inorganic Standard Orthophosphate Drinking Water Inorganic Standard
SKU: PEI-141

Orthophosphate Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
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Nitrite Drinking Water Inorganic Standard Nitrite Drinking Water Inorganic Standard
SKU: PEI-140

Nitrite Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
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Complex Nutrients (2 pack) Complex Nutrients (2 pack)
SKU: PEI-139

Complex Nutrients (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
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