# Kestrel 3500 Weather Meter vs Extech 45158 Mini Thermo-Anemometer with Humidity: specs and price compared

A sourced, side-by-side comparison of the Kestrel 3500 Weather Meter (Kestrel) and Extech 45158 Mini Thermo-Anemometer with Humidity (Extech Instruments) among anemometers.

## Side by side

| Spec | Kestrel 3500 Weather Meter | Extech 45158 Mini Thermo-Anemometer with Humidity |
| --- | --- | --- |
| US price | $209 | not published |
| Brand | Kestrel | Extech Instruments |
| Wind speed range ms | 0.6 to 40.0 m/s (1.3-89.5 mph); operational to 60.0 m/s | 1.1 to 20 m/s (2.5-44.7 mph) |
| Airflow cfm cmm | — | — |
| Velocity accuracy | Larger of ±3% of reading or 20 ft/min | ±(3% of reading + 0.4 mph) |
| Sensor type | Rotating vane (impeller) | Vane, 1 in. (24mm) diameter |
| Temperature range | -10 to 55 °C (14 to 131 °F), ±0.5 °C accuracy | -18 to 50 °C (0 to 122 °F), ±1 °C accuracy |
| Data hold logging | No built-in logging on base 3500 (shows current/max/min/avg); optional USB/RS-232 PC interface cable sold separately for one-way data transfer | Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging) |
| Backlit display | Yes | Yes |

## Key differences

- Wind speed range ms: Kestrel 3500 Weather Meter 0.6 to 40.0 m/s (1.3-89.5 mph); operational to 60.0 m/s vs Extech 45158 Mini Thermo-Anemometer with Humidity 1.1 to 20 m/s (2.5-44.7 mph)
- Velocity accuracy: Kestrel 3500 Weather Meter Larger of ±3% of reading or 20 ft/min vs Extech 45158 Mini Thermo-Anemometer with Humidity ±(3% of reading + 0.4 mph)
- Sensor type: Kestrel 3500 Weather Meter Rotating vane (impeller) vs Extech 45158 Mini Thermo-Anemometer with Humidity Vane, 1 in. (24mm) diameter
- Temperature range: Kestrel 3500 Weather Meter -10 to 55 °C (14 to 131 °F), ±0.5 °C accuracy vs Extech 45158 Mini Thermo-Anemometer with Humidity -18 to 50 °C (0 to 122 °F), ±1 °C accuracy
- Data hold logging: Kestrel 3500 Weather Meter No built-in logging on base 3500 (shows current/max/min/avg); optional USB/RS-232 PC interface cable sold separately for one-way data transfer vs Extech 45158 Mini Thermo-Anemometer with Humidity Data hold; selectable 5/10/13-second averaging (no onboard SD/USB logging)

## Sources

- Kestrel 3500 Weather Meter: https://kestrelinstruments.com/kestrel-3500-pocket-weather-meter (kestrelinstruments.com, verified 2026-08-09)
- Extech 45158 Mini Thermo-Anemometer with Humidity: https://www.extech.com/products/45158 (extech.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/anemometers/kestrel-3500-weather-meter-vs-extech-45158/
Cite: Per The Front Desk Review, Kestrel 3500 Weather Meter ($209) vs Extech 45158 Mini Thermo-Anemometer with Humidity (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/kestrel-3500-weather-meter-vs-extech-45158/
License: CC BY 4.0.