Particle Measuring Systems
7477 E. Dry Creek Parkway, 80503, Niwot, CO, United States
Visit website- Accredited standards
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- A2LA certificate
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- Site in our directory
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What this lab is accredited for
Our reading of the A2LA scope: each standard once, with its official name where we have checked it.
Only this lab. Searches the 1 standard number and the 1 official name we hold. When no standard matches, it searches the method text of every scope line.
ISO 21501-4Determination of particle size distribution - Single particle light interaction methods - Part 4: Light scattering airborne particle counter for clean spaces
ISO/IEC 17025:2017; ISO 21501-4
Read from the A2LA scope document we downloaded on 2026-03-14. Register refreshed 2026-11-06.
Scope as published by A2LA
3 lines
ISO/IEC 17025
Active3962.01
The scope document we hold says it was valid until 2026-03-31. That date has passed, so our copy may be out of date. We downloaded it from the A2LA register on 2026-03-14. Check the A2LA register for the current scope.
Accredited scope, certificate 3962.01
| Line | Method | Matrix | Range |
|---|---|---|---|
| 1 | ISO/IEC 17025:2017; ISO 21501-4 | - | 0.1 to 5 µm |
| 2 | Extracted from the scope document; tables may not line up. View scope for the original. (A2LA Cert. No. 3962.01) Revised 02/17/2026 Page 2 of 2
1 This laboratory offers commercial calibration service.
2 Calibration and Measurement Capability Uncertainty (CMC) is the smallest uncertainty of measurement
that a laboratory can achieve within its scope of accreditation when performing more or less routine
calibrations of nearly ideal measurement standards or nearly ideal measuring equipment. CMCs represent
expanded uncertainties expressed at approximately the 95 % level of confidence, usually using a coverage
factor of k = 2. The actual measurement uncertainty of a specific calibration performed by the laboratory
may be greater than the CMC due to the behavior of the customer’s device and to influences from the
circumstances of the specific calibration.
3 In the statement of CMC, percentages are percentage of reading, unless otherwise indicated.
4 This scope meets A2LA’s P112 Flexible Scope Policy. | ||
| 3 | ISO/IEC 17025:2017; R205 | - | - |
Ranges are reproduced from the accredited scope document as published, and only where we found that range printed in the document for the line. Otherwise the cell reads “See scope document”. An absent range means the register did not state one. Line numbers are ours, for cross-reference; they follow the order of the scope document.
Location
Accreditation data refreshed from the A2LA register on .
This page mirrors a public register. For a purchasing, audit or regulatory decision, confirm against the A2LA entry linked above.