The Extech AN250W is a smart, Bluetooth-enabled anemometer that measures air velocity and ambient temperature while wirelessly transmitting real-time data to iOS® or Android™ devices via the free ExView® app. Designed for HVAC, building diagnostics, and industrial maintenance, it supports remote monitoring, data logging, alarm setup, and PDF report generation with photos. Features include a bright backlit dual LCD, tripod mount, Max/Avg recording, and Data Hold — all in a compact, portable design.
| Air Velocity |
|
|
|
|
| ft/min | 295.2 to 5905 | 1 | ±5% of Full Scale | ft/min |
| m/s | 1.5 to 30 | 0.1 | ±5% of Full Scale | m/s |
| km/h | 5.4 to 108 | 0.1 | ±5% of Full Scale | km/h |
| mph | 3.3 to 67 | 0.1 | ±5% of Full Scale | mph |
| knots | 2.9 to 58 | 0.1 | ±5% of Full Scale | knots |
| Beaufort Force | 0 to 12 | 1 | ±1 | — |
| Air Temperature | 14 to 122 | 0.2 | ±4°F (±2°C) | °F / °C |
| Sampling Rate | 0.5 | — | — | seconds |
| Bluetooth Range | >10 (up to 90 line-of-sight) | — | — | meters |
| Power Supply | 3 x AAA (1.5V) batteries | — | — | — |
| Operating Conditions | 32 to 104°F (0 to 40°C), ≤80% RH | — | — | — |
| Dimensions | 6.9 x 2.1 x 1.1 | — | — | in (176x53x28mm) |
| Weight | 3.2 | — | — | oz (91.8g) |
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The Extech AN250W is a smart, Bluetooth-enabled anemometer that measures air velocity and ambient temperature while wirelessly transmitting real-time data to iOS® or Android™ devices via the free ExView® app. Designed for HVAC, building diagnostics, and industrial maintenance, it supports remote monitoring, data logging, alarm setup, and PDF report generation with photos. Features include a bright backlit dual LCD, tripod mount, Max/Avg recording, and Data Hold — all in a compact, portable design.
| Air Velocity |
|
|
|
|
| ft/min | 295.2 to 5905 | 1 | ±5% of Full Scale | ft/min |
| m/s | 1.5 to 30 | 0.1 | ±5% of Full Scale | m/s |
| km/h | 5.4 to 108 | 0.1 | ±5% of Full Scale | km/h |
| mph | 3.3 to 67 | 0.1 | ±5% of Full Scale | mph |
| knots | 2.9 to 58 | 0.1 | ±5% of Full Scale | knots |
| Beaufort Force | 0 to 12 | 1 | ±1 | — |
| Air Temperature | 14 to 122 | 0.2 | ±4°F (±2°C) | °F / °C |
| Sampling Rate | 0.5 | — | — | seconds |
| Bluetooth Range | >10 (up to 90 line-of-sight) | — | — | meters |
| Power Supply | 3 x AAA (1.5V) batteries | — | — | — |
| Operating Conditions | 32 to 104°F (0 to 40°C), ≤80% RH | — | — | — |
| Dimensions | 6.9 x 2.1 x 1.1 | — | — | in (176x53x28mm) |
| Weight | 3.2 | — | — | oz (91.8g) |