Testo
testo 405i Smart Probe Thermal Anemometer
$123.95
Best Anemometers · head-to-head
testo 405i Smart Probe Thermal 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
$37.11Cheaper
Which is better: the testo 405i Smart Probe Thermal Anemometer or HoldPeak HP-866B Digital Anemometer?
On the specs we track, they're closely matched. The HoldPeak HP-866B Digital Anemometer is the cheaper at $37.11.
See testo 405i Smart Probe Thermal Anemometer on Amazon See HoldPeak HP-866B Digital Anemometer on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | testo 405i Smart Probe Thermal Anemometer | HoldPeak HP-866B Digital Anemometer |
|---|---|---|
| US price | $123.95 | $37.11 |
| Brand | Testo | HoldPeak |
| Released | — | — |
| 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 |
Sources — testo 405i Smart Probe Thermal Anemometer: testo.com (verified 2026-08-09). HoldPeak HP-866B Digital Anemometer: holdpeak.com (verified 2026-08-09).
What's the difference between the testo 405i Smart Probe Thermal Anemometer and HoldPeak HP-866B Digital Anemometer?
Where the two actually differ on the specs we track (6 of 7). Matching specs are omitted.
- 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 false vs HoldPeak HP-866B Digital Anemometer true