# testo 405i Smart Probe Thermal Anemometer vs Proster Handheld Digital Anemometer: specs and price compared

A sourced, side-by-side comparison of the testo 405i Smart Probe Thermal Anemometer (Testo) and Proster Handheld Digital Anemometer (Proster) among anemometers. Proster Handheld Digital Anemometer is the cheaper of the two at $33.67.

## Side by side

| Spec | testo 405i Smart Probe Thermal Anemometer | Proster Handheld Digital Anemometer |
| --- | --- | --- |
| US price | $123.95 | $33.67 |
| Brand | Testo | Proster |
| Wind speed range ms | 0 to 30 m/s | 0.4 to 30 m/s (80-5900 ft/min) |
| Airflow cfm cmm | — | 0 to 99990 CFM and 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 | — |
| Sensor type | Hot-wire (thermal), foldable telescopic probe | Rotating vane |
| Temperature range | 0 to 50 °C (32 to 122 °F) | Displays temperature and wind chill, including sub-0°C readings; exact range not stated in surfaced sources |
| Data hold logging | Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display | Reading hold; max/min for handheld or fixed measurement; 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 Proster Handheld Digital Anemometer 0.4 to 30 m/s (80-5900 ft/min)
- Sensor type: testo 405i Smart Probe Thermal Anemometer Hot-wire (thermal), foldable telescopic probe vs Proster Handheld Digital Anemometer Rotating vane
- Temperature range: testo 405i Smart Probe Thermal Anemometer 0 to 50 °C (32 to 122 °F) vs Proster Handheld Digital Anemometer Displays temperature and wind chill, including sub-0°C readings; exact range not stated in surfaced sources
- Data hold logging: testo 405i Smart Probe Thermal Anemometer Hold/min/max/logging via Bluetooth-paired testo Smart App; no onboard display vs Proster Handheld Digital Anemometer Reading hold; max/min for handheld or fixed measurement; no onboard logging
- Backlit display: testo 405i Smart Probe Thermal Anemometer No vs Proster Handheld 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)
- Proster Handheld Digital Anemometer: https://www.ebay.com/itm/358241845889 (ebay.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/anemometers/testo-405i-vs-proster-handheld-anemometer/
Cite: Per The Front Desk Review, testo 405i Smart Probe Thermal Anemometer ($123.95) vs Proster Handheld Digital Anemometer ($33.67) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/anemometers/testo-405i-vs-proster-handheld-anemometer/
License: CC BY 4.0.