Extech 45158 Pocket Air Velocity and Temperature Meter

The Extech 45158 stands out among pocket anemometers by combining a low-friction ball bearing vane wheel with dual LCD readouts for simultaneous air velocity and temperature. It delivers lab-grade accuracy in a rugged, rubber-holstered format that slips into a shirt pocket.

Highlights

• Measures air velocity from 0.4 to 30 m/s (80 to 5900 ft/min) with ±3% accuracy
• Dual LCD shows air velocity and temperature at the same time
• Min/Max, Data Hold, and Average functions for field analysis
• NTC thermistor temperature sensor covers -10 to 50°C (14 to 122°F)
• Runs up to 100 hours on a single 9V battery with auto power off

In daily use

HVAC technicians and facility managers reach for the 45158 when balancing ducts, checking exhaust hoods, or verifying airflow at diffusers. The vane wheel responds quickly to fluctuating air currents, while the temperature reading helps identify stratification issues. The rubber holster absorbs knocks, and the wrist strap keeps it secure when working on ladders.

Full specifications

• Air velocity range: 0.4 to 30 m/s, 80 to 5900 ft/min, 1.4 to 108 km/h, 0.9 to 67 MPH, 0.8 to 58 knots
• Air velocity accuracy: ±3% of reading or ±0.2 m/s (±40 ft/min)
• Air velocity resolution: 0.1 m/s, 1 ft/min, 0.1 km/h, 0.1 MPH, 0.1 knots
• Temperature range: -10 to 50°C (14 to 122°F)
• Temperature accuracy: ±0.6°C (±1.2°F)
• Temperature resolution: 0.1°C/°F
• Display: Dual LCD
• Sensors: Low friction ball bearing vane wheel, NTC thermistor
• Data functions: Data Hold, Min/Max, Average
• Power: 9V battery, approx. 100 hours battery life, auto power off
• Operating conditions: 0 to 50°C (32 to 122°F), <80% RH
• Included accessories: 9V battery, wrist strap, protective rubber holster

Final note

For spot checks and commissioning work where portability and repeatability matter, the 45158 delivers professional-grade measurement without the bulk of a full-size meter.