# REED R4000SD Data Logging Vane Thermo-Anemometer vs HoldPeak HP-866B Digital Anemometer: specs and price compared

A sourced, side-by-side comparison of the REED R4000SD Data Logging Vane Thermo-Anemometer (REED Instruments) and HoldPeak HP-866B Digital Anemometer (HoldPeak) among anemometers.

## Side by side

| Spec | REED R4000SD Data Logging Vane Thermo-Anemometer | HoldPeak HP-866B Digital Anemometer |
| --- | --- | --- |
| US price | not published | $37.11 |
| Brand | REED Instruments | HoldPeak |
| 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 |

## Key differences

- 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

## Sources

- REED R4000SD Data Logging Vane Thermo-Anemometer: https://www.reedinstruments.com/product/reed-r4000sd-data-logging-vane-thermo-anemometer (reedinstruments.com, verified 2026-08-09)
- HoldPeak HP-866B Digital Anemometer: https://holdpeak.com/product/252.html (holdpeak.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/anemometers/reed-r4000sd-vs-holdpeak-hp-866b/
Cite: Per The Front Desk Review, REED R4000SD Data Logging Vane Thermo-Anemometer (not published) vs HoldPeak HP-866B Digital Anemometer ($37.11) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/reed-r4000sd-vs-holdpeak-hp-866b/
License: CC BY 4.0.