# Extech 45158 Mini Thermo-Anemometer with Humidity vs BTMETER BT-100APP Bluetooth Vane Anemometer: specs and price compared

A sourced, side-by-side comparison of the Extech 45158 Mini Thermo-Anemometer with Humidity (Extech Instruments) and BTMETER BT-100APP Bluetooth Vane Anemometer (BTMETER) among anemometers.

## Side by side

| Spec | Extech 45158 Mini Thermo-Anemometer with Humidity | BTMETER BT-100APP Bluetooth Vane Anemometer |
| --- | --- | --- |
| US price | not published | $30.99 |
| Brand | Extech Instruments | BTMETER |
| 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 |

## Key differences

- 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)

## Sources

- Extech 45158 Mini Thermo-Anemometer with Humidity: https://www.extech.com/products/45158 (extech.com, verified 2026-08-09)
- BTMETER BT-100APP Bluetooth Vane Anemometer: https://www.btmeter-store.com/products/bt-meter100-vane-anemometer (btmeter-store.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/anemometers/extech-45158-vs-btmeter-bt-100-app/
Cite: Per The Front Desk Review, Extech 45158 Mini Thermo-Anemometer with Humidity (not published) vs BTMETER BT-100APP Bluetooth Vane Anemometer ($30.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/extech-45158-vs-btmeter-bt-100-app/
License: CC BY 4.0.