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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 HoldPeak HP-866B Digital Anemometer
A sourced, side-by-side comparison. HoldPeak HP-866B Digital Anemometer is cheaper at $37.11. Every spec and price links to its source.
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HoldPeak
HoldPeak HP-866B Digital Anemometer
$37.11
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 | HoldPeak HP-866B Digital Anemometer |
|---|---|---|
| US price | — | $37.11 |
| Brand | REED Instruments | HoldPeak |
| Released | — | — |
| Wind speed range ms | 0.4 to 30 m/s (79-5906 ft/min) | 0.3 to 30 m/s (59-5905 ft/min) |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(2% of reading + 0.2 m/s / 40 ft/min) | ±5% of reading |
| Sensor type | Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing | Rotating vane |
| 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 | -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy |
| Data hold logging | Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval | Max/Min/Average hold; no onboard logging |
| Backlit display | Yes | Yes |
Sources — REED R4000SD Data Logging Vane Thermo-Anemometer: reedinstruments.com (verified 2026-08-09). HoldPeak HP-866B Digital Anemometer: holdpeak.com (verified 2026-08-09).
What's the difference between the REED R4000SD Data Logging Vane Thermo-Anemometer and HoldPeak HP-866B Digital Anemometer?
Where the two actually differ on the specs we track (5 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 HoldPeak HP-866B Digital Anemometer 0.3 to 30 m/s (59-5905 ft/min)
- Velocity accuracy: REED R4000SD Data Logging Vane Thermo-Anemometer ±(2% of reading + 0.2 m/s / 40 ft/min) vs HoldPeak HP-866B Digital Anemometer ±5% of reading
- Sensor type: REED R4000SD Data Logging Vane Thermo-Anemometer Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing vs HoldPeak HP-866B Digital Anemometer Rotating vane
- 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 HoldPeak HP-866B Digital Anemometer -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy
- Data hold logging: REED R4000SD Data Logging Vane Thermo-Anemometer Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval vs HoldPeak HP-866B Digital Anemometer Max/Min/Average hold; no onboard logging