This is an R.M. Young Co 41003 Multi-Plate Radiation Shield for Weather Sensors.
Manufacturer Description:
The 41003 Radiation Shield (universal adapter) protects temperature and/or RH sensors from error-producing solar radiation and precipitation.

Specifications:
-Sensor Types: Accommodates temperature and humidity sensors up to 26 mm (1 in) diameter.
-Radiation Error:
@ 1080 W/m intensity- Dependent on wind speed
0.4 C (0.7 F) RMS @ 3 m/s (6.7 mph)
0.7 C (1.3 F) RMS @ 2 m/s (4.5 mph)
1.5 C (2.7 F) RMS @ 1 m/s (2.2 mph)
-Construction:
UV stabilized white thermoplastic plates, aluminum mounting bracket, white powder coated Stainless steel U-bolt clamp
-Universal Adapter
12 Plate
May not have mounting hardware. please inquire.

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