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 REED R4000SD Data Logging Vane Thermo-Anemometer
A sourced, side-by-side comparison. Extech 45158 Mini Thermo-Anemometer with Humidity is cheaper at —. Every spec and price links to its source.
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REED Instruments
REED R4000SD Data Logging Vane Thermo-Anemometer
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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 | REED R4000SD Data Logging Vane Thermo-Anemometer |
|---|---|---|
| US price | — | — |
| Brand | Extech Instruments | REED Instruments |
| Released | — | — |
| Wind speed range ms | 1.1 to 20 m/s (2.5-44.7 mph) | 0.4 to 30 m/s (79-5906 ft/min) |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(3% of reading + 0.4 mph) | ±(2% of reading + 0.2 m/s / 40 ft/min) |
| Sensor type | Vane, 1 in. (24mm) diameter | Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing |
| Temperature range | -18 to 50 °C (0 to 122 °F), ±1 °C accuracy | 0 to 50 °C (32 to 122 °F) ambient probe; optional Type K (-100 to 1300 °C) / Type J (-100 to 1200 °C) thermocouple input |
| Data hold logging | Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) | Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval |
| Backlit display | Yes | Yes |
Sources — Extech 45158 Mini Thermo-Anemometer with Humidity: extech.com (verified 2026-08-09). REED R4000SD Data Logging Vane Thermo-Anemometer: reedinstruments.com (verified 2026-08-09).
What's the difference between the Extech 45158 Mini Thermo-Anemometer with Humidity and REED R4000SD Data Logging Vane Thermo-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 REED R4000SD Data Logging Vane Thermo-Anemometer 0.4 to 30 m/s (79-5906 ft/min)
- Velocity accuracy: Extech 45158 Mini Thermo-Anemometer with Humidity ±(3% of reading + 0.4 mph) vs REED R4000SD Data Logging Vane Thermo-Anemometer ±(2% of reading + 0.2 m/s / 40 ft/min)
- Sensor type: Extech 45158 Mini Thermo-Anemometer with Humidity Vane, 1 in. (24mm) diameter vs REED R4000SD Data Logging Vane Thermo-Anemometer Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing
- Temperature range: Extech 45158 Mini Thermo-Anemometer with Humidity -18 to 50 °C (0 to 122 °F), ±1 °C accuracy vs REED R4000SD Data Logging Vane Thermo-Anemometer 0 to 50 °C (32 to 122 °F) ambient probe; optional Type K (-100 to 1300 °C) / Type J (-100 to 1200 °C) thermocouple input
- Data hold logging: Extech 45158 Mini Thermo-Anemometer with Humidity Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) vs REED R4000SD Data Logging Vane Thermo-Anemometer Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval