PSC 6660

Overview

The Product Service Code (PSC) is a governmentwide taxonomy that categorizes what the U.S. government buys, supporting consistent reporting in procurement systems (such as FPDS) and standardizing analysis of spending. PSC maintenance and definitions are published in the PSC Manual on Acquisition.gov, which agencies use to select the appropriate “what was bought” code for each contract action. ¹

PSC 6660 covers Meteorological Instruments and Apparatus within the Instruments and Laboratory Equipment group. The PSC Manual lists this class and specifies representative inclusions (e.g., meteorological balloons, radiosonde and radarsonde sets) and clarifies boundaries with adjacent instrument classes, guiding coding for weather observation and atmospheric sensing equipment. ²

What this PSC covers

• Meteorological balloons used for atmospheric data collection. ²
• Radiosonde sets for upper‑air measurements and telemetry. ²
• Radarsonde sets for radar‑tracked atmospheric sounding. ²
• Radiosonde baseline check sets, when identified as belonging to class 6660. ²
• Instruments for measuring pressure, temperature, and humidity when specifically classified as meteorological instruments (not general industrial instruments). ²
• Flow, level, and mechanical motion measuring instruments where the intended use is meteorological (e.g., weather observation applications), per exclusions in adjacent classes. ²

Related NAICS and PSC codes

Related PSCs below are adjacent classes per the PSC Manual and help define the boundary of 6660. ²

Type	Code	Descriptor
PSC	6636	Environmental Chambers and Related Equipment
PSC	6685	Pressure, Temperature, and Humidity Measuring and Controlling Instruments
PSC	6680	Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments

Scope boundaries and common distinctions

• Environmental chambers (e.g., weatherometers, fadeometers, wind tunnels) used to simulate conditions for testing are coded under 6636, not 6660, which covers meteorological instruments themselves. ²
• General pressure, temperature, and humidity instruments are coded under 6685 unless specifically identified as meteorological instruments, which are classified under 6660. ²
• Flow/level/motion instruments used generally fall under 6680; meteorological use drives classification to 6660 when the instrument is a meteorological instrument. ²

Reporting context

• In FPDS, the PSC is recorded in data element 8A to indicate what product or service was purchased; the PSC Manual provides coding guidance to select the predominant product for mixed buys. ²

Frequently asked questions

• What equipment is explicitly listed under PSC 6660? The PSC Manual’s product section lists meteorological balloons, radiosonde sets, and radarsonde sets as inclusions under class 6660. Radiosonde baseline check sets are also directed to this class via exclusions noted in related categories. ²

• How is PSC 6660 different from PSC 6685? PSC 6685 covers general pressure, temperature, and humidity instruments. When those instruments are meteorological instruments, they are classified in PSC 6660. The PSC Manual’s exclusions clarify this boundary. ²

• Are environmental test chambers for weather simulation included in PSC 6660? No. Environmental chambers and related simulation equipment are coded in PSC 6636. Radiosonde baseline check sets are explicitly excluded from 6636 and pointed to PSC 6660. ²

• Is PSC 6660 used in SAM.gov searches? Yes. SAM.gov supports searching contract opportunities by PSC, and the help center provides videos and articles on searching by NAICS or PSC. ³

• Does PSC 6660 include software or services for meteorology? The PSC Manual defines 6660 as a product class for meteorological instruments/apparatus. Services are coded under service PSCs; selection should follow the Manual’s guidance on choosing the predominant product or service. ²

Useful resources

• G2X — PSC 6660 overview: https://app.g2xchange.com/psc/6660
• Acquisition.gov — PSC Manual document library (official index and current/archived manuals). ¹
• Acquisition.gov — PSC Manual April 2025 (PDF, current definitions and boundaries). ²
• SAM.gov — Help center entry showing PSC is supported in opportunity search. ³

References

1. Acquisition.gov. Product and Service Code Manual (document library). https://www.acquisition.gov/psc-manual
2. Acquisition.gov. PSC Manual April 2025 (PDF). https://origin-www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
3. SAM.gov Help — Contract Opportunities search resources (includes “Search by NAICS or PSC”). https://sam.gov/help