WEATHER STATION The YOUNG Model 81000V Ultrasonic Anemometer is a 3-axis, no-moving-parts wind sensor with four synchronized voltage input channels and serial output. The sensor features durable corrosion-resistant construction with 3 opposing pairs of ultrasonic transducers supported by stainless steel members. Each 81000V is individually wind-tunnel calibrated. Wind and sonic temperature is transmitted serially via RS-232 and RS-485. Signals from up to 4 additional voltage devices may also be included in the serial string. The sensor installs on standard 1 inch pipe.  Includes: (1) RM Young 81000 3D Ultrasonic Anemometer Voltage and Serial Output Required for Sensor Cable 8 conductor shielded (# 18660) Specifications: Wind Speed: 0 to 40 m/s (0 to 90 mph); Resolution: 0.01 m/s; Threshold: 0.01 m/s ; Accuracy: ±1% ±0.05m/s (30 m/s), ±3% (40 m/s) Wind Direction: 0 to 360 degrees; Elevation Range: ±60 degrees; Resolution: 0.1 degree; Accuracy: ± 2 degrees (30 m/s), ± 5 degrees (40 m/s). Speed of Sound: 300 to 360 m/s; Resolution: 0.01 m/s; Accuracy: ± 0.1% ± 0.05 m/s (30 m/s) Sonic Temperature: -50 to +50 ËšC; Resolution: 0.01 m/s; Accuracy: ±2ËšC (30 m/s). Serial Output: User Programmable ASCII, RS-232 or RS-485; 1200 to 38400 baud; 4 to 32 Hz (user-selected); Units: m/s, cm/s, mph, knots, km/h. Analog Voltage Outputs: 4 voltage outputs, 0 to 5000 mV Power Requirement: 12 to 24 VDC, 110 mA Operating Temperature: -50 to +50 °C Dimensions: 56cm high x 17cm radius (3 support arms); Weight: 1.2 kg (2.6 lb); Shipping Weight: 4.5 kg (10 lb)