Air Velocity Range: 100 to 5500 ft/min, 0.5 to 28 m/s, 2 to 100 km/h, 1 to 62 mph, 1 to 54.3 knots, 1 to 17 Beaufort.
Temperature/Windchill Ranges: 0 to 122°F (0.1°)/-18 to 50°C (0.1°).
Relative Humidity: 10% to 95% (model 45158 only).
Accuracy: Wind speed: ±3% of reading; Temperature: ±1.8°F/±1°C; Relative Humidity: ±5% RH.
Air Velocity Units: m/s, mph, knots, km/hr, ft/min, Beaufort.
Resolution: 0.2 mph.
Sample Time: 1 reading per second.
Averaging: 5, 10, or 13 second intervals.
Water-resistant: to 3 ft (1 meter).
Wind Speed: Limits: 0.5 to 89 mph.
Power: Lithium battery (CR-2032 or equivalent) 400 hour life expectancy, replaceable.
Auto-off: 30 minutes after last key is pressed.
Impeller: Plastic, replaceable.
Case: Plastic.
Weight: 3 oz (95 g).
Agency Approvals: CE.

Air Velocity Range: 100 to 5500 ft/min, 0.5 to 28 m/s, 2 to 100 km/h, 1 to 62 mph, 1 to 54.3 knots, 1 to 17 Beaufort.
Temperature/Windchill Ranges: 0 to 122°F (0.1°)/-18 to 50°C (0.1°).
Relative Humidity: 10% to 95% (model 45158 only).
Accuracy: Wind speed: ±3% of reading; Temperature: ±1.8°F/±1°C; Relative Humidity: ±5% RH.
Air Velocity Units: m/s, mph, knots, km/hr, ft/min, Beaufort.
Resolution: 0.2 mph.
Sample Time: 1 reading per second.
Averaging: 5, 10, or 13 second intervals.
Water-resistant: to 3 ft (1 meter).
Wind Speed: Limits: 0.5 to 89 mph.
Power: Lithium battery (CR-2032 or equivalent) 400 hour life expectancy, replaceable.
Auto-off: 30 minutes after last key is pressed.
Impeller: Plastic, replaceable.
Case: Plastic.
Weight: 3 oz (95 g).
Agency Approvals: CE.