# testo 405i Smart Probe Thermal Anemometer vs BTMETER BT-100APP Bluetooth Vane Anemometer: specs and price compared

A sourced, side-by-side comparison of the testo 405i Smart Probe Thermal Anemometer (Testo) and BTMETER BT-100APP Bluetooth Vane Anemometer (BTMETER) among anemometers. BTMETER BT-100APP Bluetooth Vane Anemometer is the cheaper of the two at $30.99.

## Side by side

| Spec | testo 405i Smart Probe Thermal Anemometer | BTMETER BT-100APP Bluetooth Vane Anemometer |
| --- | --- | --- |
| US price | $123.95 | $30.99 |
| Brand | Testo | BTMETER |
| Wind speed range ms | 0 to 30 m/s | 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 | ±(0.1 m/s + 5% of reading) below 2 m/s; ±(0.3 m/s + 5% of reading) 2-15 m/s | ±5% of reading |
| Sensor type | Hot-wire (thermal), foldable telescopic probe | 8-vane wheel with dual temperature sensors |
| Temperature range | 0 to 50 °C (32 to 122 °F) | -10 to 45 °C (14 to 113 °F), ±2 °C accuracy |
| Data hold logging | Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display | Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging) |
| Backlit display | No | Yes |

## Key differences

- Wind speed range ms: testo 405i Smart Probe Thermal Anemometer 0 to 30 m/s vs BTMETER BT-100APP Bluetooth Vane Anemometer 0.3 to 30 m/s (0.67-67.1 mph)
- Velocity accuracy: testo 405i Smart Probe Thermal Anemometer ±(0.1 m/s + 5% of reading) below 2 m/s; ±(0.3 m/s + 5% of reading) 2-15 m/s vs BTMETER BT-100APP Bluetooth Vane Anemometer ±5% of reading
- Sensor type: testo 405i Smart Probe Thermal Anemometer Hot-wire (thermal), foldable telescopic probe vs BTMETER BT-100APP Bluetooth Vane Anemometer 8-vane wheel with dual temperature sensors
- Temperature range: testo 405i Smart Probe Thermal Anemometer 0 to 50 °C (32 to 122 °F) vs BTMETER BT-100APP Bluetooth Vane Anemometer -10 to 45 °C (14 to 113 °F), ±2 °C accuracy
- Data hold logging: testo 405i Smart Probe Thermal Anemometer Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display vs BTMETER BT-100APP Bluetooth Vane Anemometer Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging)
- Backlit display: testo 405i Smart Probe Thermal Anemometer No vs BTMETER BT-100APP Bluetooth Vane Anemometer Yes

## Sources

- testo 405i Smart Probe Thermal Anemometer: https://www.testo.com/en-US/testo-405i/p/0560-1405 (testo.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/testo-405i-vs-btmeter-bt-100-app/
Cite: Per The Front Desk Review, testo 405i Smart Probe Thermal Anemometer ($123.95) vs BTMETER BT-100APP Bluetooth Vane Anemometer ($30.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/testo-405i-vs-btmeter-bt-100-app/
License: CC BY 4.0.