# testo 405i Smart Probe Thermal Anemometer vs HoldPeak HP-866B Digital Anemometer: specs and price compared

A sourced, side-by-side comparison of the testo 405i Smart Probe Thermal Anemometer (Testo) and HoldPeak HP-866B Digital Anemometer (HoldPeak) among anemometers. HoldPeak HP-866B Digital Anemometer is the cheaper of the two at $37.11.

## Side by side

| Spec | testo 405i Smart Probe Thermal Anemometer | HoldPeak HP-866B Digital Anemometer |
| --- | --- | --- |
| US price | $123.95 | $37.11 |
| Brand | Testo | HoldPeak |
| Wind speed range ms | 0 to 30 m/s | 0.3 to 30 m/s (59-5905 ft/min) |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(0.1 m/s + 5% of reading) below 2 m/s; ±(0.3 m/s + 5% of reading) 2-15 m/s | ±5% of reading |
| Sensor type | Hot-wire (thermal), foldable telescopic probe | Rotating vane |
| Temperature range | 0 to 50 °C (32 to 122 °F) | -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy |
| Data hold logging | Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display | Max/Min/Average hold; no onboard logging |
| Backlit display | No | Yes |

## Key differences

- Wind speed range ms: testo 405i Smart Probe Thermal Anemometer 0 to 30 m/s vs HoldPeak HP-866B Digital Anemometer 0.3 to 30 m/s (59-5905 ft/min)
- Velocity accuracy: 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 vs HoldPeak HP-866B Digital Anemometer ±5% of reading
- Sensor type: testo 405i Smart Probe Thermal Anemometer Hot-wire (thermal), foldable telescopic probe vs HoldPeak HP-866B Digital Anemometer Rotating vane
- Temperature range: testo 405i Smart Probe Thermal Anemometer 0 to 50 °C (32 to 122 °F) vs HoldPeak HP-866B Digital Anemometer -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy
- Data hold logging: testo 405i Smart Probe Thermal Anemometer Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display vs HoldPeak HP-866B Digital Anemometer Max/Min/Average hold; no onboard logging
- Backlit display: testo 405i Smart Probe Thermal Anemometer No vs HoldPeak HP-866B Digital Anemometer Yes

## Sources

- testo 405i Smart Probe Thermal Anemometer: https://www.testo.com/en-US/testo-405i/p/0560-1405 (testo.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/testo-405i-vs-holdpeak-hp-866b/
Cite: Per The Front Desk Review, testo 405i Smart Probe Thermal Anemometer ($123.95) vs HoldPeak HP-866B Digital Anemometer ($37.11) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/testo-405i-vs-holdpeak-hp-866b/
License: CC BY 4.0.