Testo
testo 405i Smart Probe Thermal Anemometer
$123.95
Best Anemometers · head-to-head
testo 405i Smart Probe Thermal Anemometer 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
$30.99Cheaper
Which is better: the testo 405i Smart Probe Thermal Anemometer or BTMETER BT-100APP Bluetooth Vane Anemometer?
On the specs we track, they're closely matched. The BTMETER BT-100APP Bluetooth Vane Anemometer is the cheaper at $30.99.
See testo 405i Smart Probe Thermal Anemometer on Amazon See BTMETER BT-100APP Bluetooth Vane Anemometer on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | testo 405i Smart Probe Thermal Anemometer | BTMETER BT-100APP Bluetooth Vane Anemometer |
|---|---|---|
| US price | $123.95 | $30.99 |
| Brand | Testo | BTMETER |
| Released | — | — |
| 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 |
Sources — testo 405i Smart Probe Thermal Anemometer: testo.com (verified 2026-08-09). BTMETER BT-100APP Bluetooth Vane Anemometer: btmeter-store.com (verified 2026-08-09).
What's the difference between the testo 405i Smart Probe Thermal Anemometer and BTMETER BT-100APP Bluetooth Vane Anemometer?
Where the two actually differ on the specs we track (6 of 7). Matching specs are omitted.
- 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 false vs BTMETER BT-100APP Bluetooth Vane Anemometer true