# Extech 45158 Mini Thermo-Anemometer with Humidity vs HoldPeak HP-866B Digital Anemometer: specs and price compared

A sourced, side-by-side comparison of the Extech 45158 Mini Thermo-Anemometer with Humidity (Extech Instruments) and HoldPeak HP-866B Digital Anemometer (HoldPeak) among anemometers.

## Side by side

| Spec | Extech 45158 Mini Thermo-Anemometer with Humidity | HoldPeak HP-866B Digital Anemometer |
| --- | --- | --- |
| US price | not published | $37.11 |
| Brand | Extech Instruments | HoldPeak |
| Wind speed range ms | 1.1 to 20 m/s (2.5-44.7 mph) | 0.3 to 30 m/s (59-5905 ft/min) |
| Airflow cfm cmm | — | — |
| Velocity accuracy | ±(3% of reading + 0.4 mph) | ±5% of reading |
| Sensor type | Vane, 1 in. (24mm) diameter | Rotating vane |
| Temperature range | -18 to 50 °C (0 to 122 °F), ±1 °C accuracy | -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy |
| Data hold logging | Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) | Max/Min/Average hold; no onboard logging |
| Backlit display | Yes | Yes |

## Key differences

- Wind speed range ms: Extech 45158 Mini Thermo-Anemometer with Humidity 1.1 to 20 m/s (2.5-44.7 mph) vs HoldPeak HP-866B Digital Anemometer 0.3 to 30 m/s (59-5905 ft/min)
- Velocity accuracy: Extech 45158 Mini Thermo-Anemometer with Humidity ±(3% of reading + 0.4 mph) vs HoldPeak HP-866B Digital Anemometer ±5% of reading
- Sensor type: Extech 45158 Mini Thermo-Anemometer with Humidity Vane, 1 in. (24mm) diameter vs HoldPeak HP-866B Digital Anemometer Rotating vane
- Temperature range: Extech 45158 Mini Thermo-Anemometer with Humidity -18 to 50 °C (0 to 122 °F), ±1 °C accuracy vs HoldPeak HP-866B Digital Anemometer -10 to 45 °C (14 to 113 °F), ±3.6 °F accuracy
- Data hold logging: Extech 45158 Mini Thermo-Anemometer with Humidity Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) vs HoldPeak HP-866B Digital Anemometer Max/Min/Average hold; no onboard logging

## Sources

- Extech 45158 Mini Thermo-Anemometer with Humidity: https://www.extech.com/products/45158 (extech.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/extech-45158-vs-holdpeak-hp-866b/
Cite: Per The Front Desk Review, Extech 45158 Mini Thermo-Anemometer with Humidity (not published) vs HoldPeak HP-866B Digital Anemometer ($37.11) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/extech-45158-vs-holdpeak-hp-866b/
License: CC BY 4.0.