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Enter the fascinating world of monodisperse particles.....

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Optimal for Particle Counters:     Calibration Standards - LS Series

These NIST traceable particle size standards fully accomplish the requirements of particle counting instruments:
The particle concentration to measure may not be to low to guarantee statistical count security. It also may not be to high to avoid the   Coincidence Effect   which leads to definitely wrong measurement results. To overcome these problems we designed the solids content of each size standard in dependance of its diameter. The bigger the particles are the higher the solids content has to be to keep the particle concentration itself constant.
By this you will get with an approximately identical number of drops (listed in each certificate) a particle concentration of appr. 5000 particles per mL. This means you can start to calibrate or measure immediately with no need for time consuming consecutive dilutions of the size standard.

Scope of Delivery and Shelf Life....

5ml or 20mL dropper-tipped-bottle with a certificate which also comprises the particle size distribution as a graph aditionally.
As an budget-priced alternative 6 sets are availble, too. These sets contain useful compilations of the mostly needed calibrants and their certificates. The Sets are protected by a stable box containing either 7 bottles of 5mL or 5 bottles of 20ml each.
The documented shelf life is 3 years from date of delivery.

  Example of a Certificate   

  Calibration Standard Sets   

  Price List   

Nominal
Size
Particle Diameter
(Mode)
Rel. Standard
Deviation (CV)
Volume Catalog
Number
Price Inventory
1.0 µm 1.00µm ±0.05µm 2.7%  5mL
20mL
LS0100-05
LS0100-20
  
immediately available
immediately available
1.5 µm 1.45µm ±0.04µm 1.8%  5mL
20mL
LS0150-05
LS0150-20
  
immediately available
immediately available
1.8 µm 1.83µm ±0.03µm 1.7%  5mL
20mL
LS0180-05
LS0180-20
  
immediately available
immediately available
2.0 µm 2.03µm ±0.06µm 2.1%   5mL
20mL
LS0200-05
LS0200-20
  
immediately available
immediately available
4.0 µm 3.77µm ±0.09µm 4.0%  5mL
20mL
LS0400-05
LS0400-20
  
immediately available
immediately available
4.5 µm 4.58µm ±0.11µm 4.0%  5mL
20mL
LS0450-05
LS0450-20
  
immediately available
immediately available
5.0 µm 4.88µm ±0.10µm 2.4%  5mL
20mL
LS0500-05
LS0500-20
  
immediately available
immediately available
7.0 µm 6.76µm ±0.08µm 2.8%  5mL
20mL
LS0700-05
LS0700-20
  
immediately available
immediately available
8.0 µm 8.03µm ±0.10µm 3.0%  5mL
20mL
LS0800-05
LS0800-20
  
immediately available
immediately available
9.0 µm 9.33µm ±0.10µm 3.0%  5mL
20mL
LS0900-05
LS0900-20
  
immediately available
immediately available
10 µm 9.70µm ±0.08µm 2.2%  5mL
20mL
LS1000-05
LS1000-20
  
immediately available
immediately available
14 µm 13.49µm ±0.11µm 2.9%  5mL
20mL
LS1400-05
LS1400-20
  
immediately available
immediately available
20 µm 19.55µm ±0.20µm 2.8%  5mL
20mL
LS2000-05
LS2000-20
  
immediately available
immediately available
25 µm 24.2 µm ±0.3µm 1.9%  5mL
20mL
LS2500-05
LS2500-20
  
immediately available
immediately available
27 µm 27.0 µm ±0.3µm 3.8%  5mL
20mL
LS2700-05
LS2700-20
  
immediately available
immediately available
30 µm 28.9 µm ±0.4µm 2.6%  5mL
20mL
LS3000-05
LS3000-20
  
immediately available
immediately available
40 µm 40.3 µm ±0.3µm 2.2%  5mL
20mL
LS4000-05
LS4000-20
  
immediately available
immediately available
50 µm 50.4 µm ±0.4µm 1.9%  5mL
20mL
LS5000-05
LS5000-20
  
immediately available
immediately available
80 µm 79.4 µm ±0.6µm 2.2%  5mL
20mL
LS8000-05
LS8000-20
  
immediately available
immediately available