GSA Federal Acquisition Service
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Wildland Fire & Equipment
Geophysical Analysis

Look here for air temperature measuring instruments, solar radiation measuring instruments, barometric pressure measuring instruments, environmental data loggers & recorders, humidity, precipitation and wind measuring instruments.
Source
Description
MAS Multiple Award Schedule - Available offerings include commercial goods and services organized by 12 Large Categories, corresponding Subcategories, and SINs.
66 SCIENTIFIC EQUIPMENT AND SERVICES - Test and Measurement Equipment, Unmanned Scientific Vehicles; Laboratory Instruments, Furnishings and LIMS; Geophysical and Environmental Analysis Equipment; and Mechanical, Chemical, Electrical, and Geophysical Testing Services