Extech Instruments
Extech 45158 Mini Thermo-Anemometer with Humidity
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Best Anemometers · head-to-head
Extech 45158 Mini Thermo-Anemometer with Humidity vs BTMETER BT-100APP Bluetooth Vane Anemometer
A sourced, side-by-side comparison. BTMETER BT-100APP Bluetooth Vane Anemometer is cheaper at $30.99. Every spec and price links to its source.
BTMETER
BTMETER BT-100APP Bluetooth Vane Anemometer
$30.99
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Extech 45158 Mini Thermo-Anemometer with Humidity | BTMETER BT-100APP Bluetooth Vane Anemometer |
|---|---|---|
| US price | — | $30.99 |
| Brand | Extech Instruments | BTMETER |
| Released | — | — |
| Wind speed range ms | 1.1 to 20 m/s (2.5-44.7 mph) | 0.3 to 30 m/s (0.67-67.1 mph) |
| Airflow cfm cmm | — | CFM = velocity (ft/min) x duct cross-sectional area (ft²), user-entered area |
| Velocity accuracy | ±(3% of reading + 0.4 mph) | ±5% of reading |
| Sensor type | Vane, 1 in. (24mm) diameter | 8-vane wheel with dual temperature sensors |
| Temperature range | -18 to 50 °C (0 to 122 °F), ±1 °C accuracy | -10 to 45 °C (14 to 113 °F), ±2 °C accuracy |
| Data hold logging | Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) | Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging) |
| Backlit display | Yes | Yes |
Sources — Extech 45158 Mini Thermo-Anemometer with Humidity: extech.com (verified 2026-08-09). BTMETER BT-100APP Bluetooth Vane Anemometer: btmeter-store.com (verified 2026-08-09).
What's the difference between the Extech 45158 Mini Thermo-Anemometer with Humidity and BTMETER BT-100APP Bluetooth Vane Anemometer?
Where the two actually differ on the specs we track (5 of 7). Matching specs are omitted.
- Wind speed range ms: Extech 45158 Mini Thermo-Anemometer with Humidity 1.1 to 20 m/s (2.5-44.7 mph) vs BTMETER BT-100APP Bluetooth Vane Anemometer 0.3 to 30 m/s (0.67-67.1 mph)
- Velocity accuracy: Extech 45158 Mini Thermo-Anemometer with Humidity ±(3% of reading + 0.4 mph) vs BTMETER BT-100APP Bluetooth Vane Anemometer ±5% of reading
- Sensor type: Extech 45158 Mini Thermo-Anemometer with Humidity Vane, 1 in. (24mm) diameter vs BTMETER BT-100APP Bluetooth Vane Anemometer 8-vane wheel with dual temperature sensors
- Temperature range: Extech 45158 Mini Thermo-Anemometer with Humidity -18 to 50 °C (0 to 122 °F), ±1 °C accuracy vs BTMETER BT-100APP Bluetooth Vane Anemometer -10 to 45 °C (14 to 113 °F), ±2 °C accuracy
- Data hold logging: Extech 45158 Mini Thermo-Anemometer with Humidity Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) vs BTMETER BT-100APP Bluetooth Vane Anemometer Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging)