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REED Instruments
REED R4000SD Data Logging Vane Thermo-Anemometer
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Best Anemometers · head-to-head
REED R4000SD Data Logging Vane Thermo-Anemometer 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 | REED R4000SD Data Logging Vane Thermo-Anemometer | testo 405i Smart Probe Thermal Anemometer |
|---|---|---|
| US price | — | $123.95 |
| Brand | REED Instruments | Testo |
| Released | — | — |
| Wind speed range ms | 0.4 to 30 m/s (79-5906 ft/min) | 0 to 30 m/s |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(2% of reading + 0.2 m/s / 40 ft/min) | ±(0.1 m/s + 5% of reading) below 2 m/s; ±(0.3 m/s + 5% of reading) 2-15 m/s |
| Sensor type | Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing | Hot-wire (thermal), foldable telescopic probe |
| Temperature range | 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 | 0 to 50 °C (32 to 122 °F) |
| Data hold logging | Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval | Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display |
| Backlit display | Yes | No |
Sources — REED R4000SD Data Logging Vane Thermo-Anemometer: reedinstruments.com (verified 2026-08-09). testo 405i Smart Probe Thermal Anemometer: testo.com (verified 2026-08-09).
What's the difference between the REED R4000SD Data Logging Vane Thermo-Anemometer 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: REED R4000SD Data Logging Vane Thermo-Anemometer 0.4 to 30 m/s (79-5906 ft/min) vs testo 405i Smart Probe Thermal Anemometer 0 to 30 m/s
- Velocity accuracy: REED R4000SD Data Logging Vane Thermo-Anemometer ±(2% of reading + 0.2 m/s / 40 ft/min) 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: REED R4000SD Data Logging Vane Thermo-Anemometer Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing vs testo 405i Smart Probe Thermal Anemometer Hot-wire (thermal), foldable telescopic probe
- Temperature range: 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 vs testo 405i Smart Probe Thermal Anemometer 0 to 50 °C (32 to 122 °F)
- Data hold logging: REED R4000SD Data Logging Vane Thermo-Anemometer Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval vs testo 405i Smart Probe Thermal Anemometer Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display
- Backlit display: REED R4000SD Data Logging Vane Thermo-Anemometer true vs testo 405i Smart Probe Thermal Anemometer false