Description
The Testo 405i is a Bluetooth® hot-wire anemometer that measures air velocity, temperature and volume flow straight from your phone. Built for HVAC techs who want fast, reliable duct traverses and tidy PDF/Excel reports without mucking about. Fair dinkum time-saver.
Key Features & Trade Benefits
- 400 mm telescopic probe → Reach deeper into ducts for repeatable traverses and better averages.
- 0–30 m/s velocity, −20 to +60 °C → Broad range for supply/return and IAQ checks on site. Accuracy: ±(0.1 m/s + 5% of m.v.) at 0–2 m/s; ±(0.3 m/s + 5% of m.v.) at 2–15 m/s.
- Volume-flow via app → Punch in duct size/geometry and let the app do the maths—fewer call-backs, quicker sign-offs.
- Timed & multi-point mean → Proper duct traverses and trend graphs without spreadsheets.
- PDF/Excel reporting → Email logs from the roof or plant room—no worries.
- 2-year warranty → Backed by Testo support for trade use.
Why This Product Matters
Real-world: you’re balancing a long branch on a Brisbane retrofit, arvo sun hitting the roof and the tenant’s complaining about a hot boardroom. With the 405i extended to 400 mm, you run a multi-point traverse, the Smart App calculates volume flow, and your report’s on the client’s desk before you’re back down the ladder. That’s a bloody good result—and fewer repeat visits. For more Bluetooth tools that pair nicely, see our Bluetooth Smart Tools.
Pro Tip
For commissioning or diagnostics, pair the 405i with the Testo 605i thermohygrometer to capture temperature/RH and calculate capacities alongside air velocity. Keeps reports tidy and proves the numbers to facility managers.
Compatibility & System Info
- Smartphone OS: iOS 13+ / Android 8.0+ with Bluetooth 4.0 (or newer).
- Measurement ranges: Air velocity 0–30 m/s (0.01 m/s resolution); Temperature −20 to +60 °C (0.1 °C resolution).
- Probe: Telescopes to 400 mm with hot-wire sensor for ducts and room air.
- Power: 3 × AAA, ~15 hrs typical.
Local SEO Reference
Ideal for rooftop AHU checks in Sydney (windy conditions, tight access) and school IAQ spot-checks in Brisbane. Small, rugged, and she’ll be right in a service bag.
What’s Included
- 1 × Testo 405i hot-wire anemometer (0560 1405)
- 1 × Set of AAA batteries
- Calibration protocol
Per Testo datasheet and HVAC Shop listing.
Specifications
| Spec | Detail (Metric) |
|---|---|
| Air velocity | 0–30 m/s; Accuracy ±(0.1 m/s + 5% of m.v.) at 0–2 m/s; ±(0.3 m/s + 5% of m.v.) at 2–15 m/s; Resolution 0.01 m/s |
| Temperature | −20 to +60 °C; Accuracy ±0.5 °C; Resolution 0.1 °C |
| Probe length | Telescopic to 400 mm |
| Power | 3 × AAA batteries; ~15 hrs typical |
| Dimensions | Approx. 200 × 30 × 41 mm (instrument body) |
| Warranty | 2 years (Testo) |
Warranty & Returns
Backed by a 2-year Testo warranty. HVAC Shop returns are accepted on unused items in original packaging—see our Shipping & Returns policy for details.
FAQs
- Can the 405i calculate volume flow (L/s, m³/h)?
- Yes—enter duct dimensions/geometry in the Testo Smart App and it auto-calculates flow with timed/multi-point means.
- Is it suitable for test & balance (TAB)?
- It’s designed for duct traverses with multi-point averaging. Use steady technique and enough points for reliable TAB results. Pair with the 605i to capture dry-bulb/RH during commissioning.
- Will it work on my phone?
- Works with the Testo Smart App on iOS 13+ and Android 8.0+ devices with Bluetooth 4.0 or newer.
- Is it weatherproof?
- It’s intended for ducts/indoor use. Protect the probe from rain and heavy condensation to maintain sensor accuracy.
Related Products
- Testo 605i Thermohygrometer — Helpful when you want temp/RH alongside velocity to explain comfort complaints.
- Testo 410i Vane Anemometer — Handy at outlets where a vane is more stable than a hot-wire.
- Testo Smart Probes VAC Set — A neat bundle including 405i/410i/605i to cover airflow and temp/RH in one case.
See the official Testo 405i specifications for manufacturer details and updates.
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