Thermo Scientific™ Validex™ Count Precision Size Standards Available on GSA/VA Contract for Federal Government customers only.

Validate the performance of liquid particle counters with Thermo Scientific™ Validex™ Count Precision Size Standards.

Manufacturer: Thermo Scientific™ CRS05

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Catalog No. 09-980-237

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    Size Distribution <3
    Type Count Control Particles
    For Use With (Application) Liquid Particle Counter Validation
    Diameter (Metric) 5μm ± 0.1μm
    Additive Contains trace amount of surfactant
    Description Designed specifically for the drinking water industry to validate the performance of liquid particle counters.
    Diameter (Metric) Particle 5 ± 0.1µm
    Material Polystyrene,Polystyrene
    Particle Density 1.05g/cm³
    Quantity 500mL
    Refractive Index 1.59 at 589nm (25°C)
    Stability Product stable for a minimum of 3 months
    Storage Requirements Unless otherwise stated, refrigerate (2° to 8°C) product when not in use but do not freeze. Store upright and keep bottle tightly sealed. Mix product with gentle inversion by hand or vortex mixer.
    Concentration 1000 particles/mL ± 10%
    Includes Certificate of Calibration and Traceability to NIST
    Composition Polystyrene
    Contents Polymer particles in water
    Density 1.05g/cm3

    Validate the performance of liquid particle counters with Thermo Scientific™ Validex™ Count Precision Size Standards. Excellent for instrument calibration and verification in the drinking water industry and for low level liquid particle counting and calibration, standards contain NIST™-traceable polymer particles packaged in ultrapure water at concentrations ideal for use in validating the performance of liquid particle counters.

    Particle counting in the drinking water industry has rapidly become an indispensable technology for optimizing water quality. The majority of particle counters used in the drinking water industry operate on the principle of single particle light obscuration.


    • Composition of suspension optimized to promote dispersion of particles
    • Contains 500mL of suspension at a nominal concentration of 1000 particles per mL
    • Stir bar included in the bottle to aid dispersion
    • Certified concentration
    • Ultraclean diluent
    • No dilution required
    • Sample directly from bottle to avoid contamination
    • Larger volume for appropriate testing

  • Description & Specifications

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