Portable Digital Anemometer Handheld Air Flow Velocity Tester Wind Speed Meter Anemometer Item Type: Digital Anemometer Model: TA642C Material: ABS Measurement Mode: Split Type Wind Speed Measurement Range: 0.06-45.0m/s Accuracy: ±0.2 + (±2% Reading) Resolution: 0.01/0.1/1 Wind Temperature Measurement Range: 0-45°C (32.0-113.0°F) Accuracy: ±2°C (±3.6°F) Resolution: 0.1/1 Wind Speed Display: 4 Digit Display, Maximum 9999 Sensor: Infrared Laser to Tube Cutting Method Sampling Rate: 2 Times/s Repeat Test: ±2% Data Storage: 1000 writes Firmware Update: Synchronized PC Update Product Firmware Upgrade (Specifically refer to the PC. Upper Computer Software Description) Automatic Shutdown: 15 Minutes ( Can be manually shut down ) Use Environment: -10 ~ 50 ° C, Maximum 80% Relative Humidity, Indoor Altitude <2000m Storage Environment: -10~50°C, Maximum 70% Relative Humidity (Remove Battery) Battery: 1.5V AA battery x 3 ( Without Battery )