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 testo 405i Smart Probe Thermal Anemometer
A sourced, side-by-side comparison. testo 405i Smart Probe Thermal Anemometer is cheaper at $123.95. Every spec and price links to its source.
Testo
testo 405i Smart Probe Thermal Anemometer
$123.95
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 | testo 405i Smart Probe Thermal Anemometer |
|---|---|---|
| US price | — | $123.95 |
| Brand | Extech Instruments | Testo |
| Released | — | — |
| Wind speed range ms | 1.1 to 20 m/s (2.5-44.7 mph) | 0 to 30 m/s |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(3% of reading + 0.4 mph) | ±(0.1 m/s + 5% of reading) below 2 m/s; ±(0.3 m/s + 5% of reading) 2-15 m/s |
| Sensor type | Vane, 1 in. (24mm) diameter | Hot-wire (thermal), foldable telescopic probe |
| Temperature range | -18 to 50 °C (0 to 122 °F), ±1 °C accuracy | 0 to 50 °C (32 to 122 °F) |
| Data hold logging | Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) | Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display |
| Backlit display | Yes | No |
Sources — Extech 45158 Mini Thermo-Anemometer with Humidity: extech.com (verified 2026-08-09). testo 405i Smart Probe Thermal Anemometer: testo.com (verified 2026-08-09).
What's the difference between the Extech 45158 Mini Thermo-Anemometer with Humidity and testo 405i Smart Probe Thermal Anemometer?
Where the two actually differ on the specs we track (6 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 testo 405i Smart Probe Thermal Anemometer 0 to 30 m/s
- Velocity accuracy: Extech 45158 Mini Thermo-Anemometer with Humidity ±(3% of reading + 0.4 mph) vs 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
- Sensor type: Extech 45158 Mini Thermo-Anemometer with Humidity Vane, 1 in. (24mm) diameter vs testo 405i Smart Probe Thermal Anemometer Hot-wire (thermal), foldable telescopic probe
- Temperature range: Extech 45158 Mini Thermo-Anemometer with Humidity -18 to 50 °C (0 to 122 °F), ±1 °C accuracy vs testo 405i Smart Probe Thermal Anemometer 0 to 50 °C (32 to 122 °F)
- Data hold logging: Extech 45158 Mini Thermo-Anemometer with Humidity Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) vs testo 405i Smart Probe Thermal Anemometer Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display
- Backlit display: Extech 45158 Mini Thermo-Anemometer with Humidity true vs testo 405i Smart Probe Thermal Anemometer false