This is a Kestrel known as the Rotating Vane Mount And Case, model 0782.
A lot of thought was put into making this vane mount for the 5000 Kestrel series. It's a simpler design than the last and much more durable. The meter snaps right into it and will mount to any tripod or other 1/4-20 fitted bracket" allowing use of an extension pole for taking wind or air flow readings.. This turns your Kestrel into a full-featured weather station with a large wind vane and precision pivot that keeps the Kestrel oriented into the wind for continuous measurement and logging of wind speed" wind direction" and all other key weather parameters.
Features:
Weight: 10.5 ounces / 295 grams
Size: 2.5 x 3 x 8.5 inches / 6.5 x 7.5 x 22 cm. Model Number: 0782
Compatible with: All Kestrel 5 Series meters. It will not fit any of the meters below the 5000 series.