Testo 915i Wireless Thermometer (Type K) gives HVAC techs fast, flexible temperature measurement straight to the phone or handheld—no cables, no fuss, just clean data and quick reporting. Perfect for ducts, coils, fridges and hard-to-reach spots—too easy.
Key Features & Trade Benefits
- Flexible Class 1 Type K probe (800 mm) — snakes through door seals and gaps; reach what rigid probes can’t, then log temps instantly. t ≈ 3 s.
- Wide range & fine resolution — −50 to +400 °C, 0.1 °C resolution for precise set-point checks on coils, ducts and hot-water lines.
- Long-range Bluetooth — up to ~100 m (328 ft) line-of-sight so you can read from the ground while the probe sits at the unit. Bloody good for roof work.
- Smart App workflows — trend graphs, PDFs/CSV, and job sharing right from site; integrates with Testo instruments (e.g., 550s/557s).
- Battery & build for the field — 3×AAA, up to ~150 h run-time; IP40 housing with lock-in probe connection.
- Probe compatibility — handle accepts standard Type K thermocouples for surface/air/liquid tasks—she’ll be right across different jobs.
Why This Product Matters
Real-world: up on a Brisbane cool-room, we routed the flexible probe through the door seal to verify defrost termination. The 915i held steady at the target temp while we watched the curve on the phone from the ground—no ladder yo-yoing, no guesswork. Call-backs? Not today, mate.
Compare options in our Thermometers category if you need surface or air configurations out of the box.
Pro Tip
For accurate air temps in ducts, shield the bead from radiant surfaces and let readings stabilise (watch the Smart App curve). When measuring through a cold-room door, lightly cushion the cable to avoid compressing the seal—no worries.
Compatibility & System Info
- Connection: Bluetooth to the free Testo Smart App (iOS/Android). Works alongside Testo gauges like 550s/557s.
- Probe interface: lockable handle for Testo plug-in probes; accepts common Type K thermocouples.
- Typical use: HVAC commissioning, refrigeration checks, coil/duct diagnostics, kitchen hoods, hydronic loops.
- Range & power: up to 100 m (LoS); 3×AAA; ~150 h battery life.
Australia-ready: from steamy Sydney rooftops to wintry Melbourne plant rooms, long Bluetooth range and a flexible probe mean fewer climbs and quicker sign-offs—fair dinkum time saver.
What’s Included
- Testo 915i wireless thermometer handle
- Flexible Type K probe (≈800 mm)
- 3×AAA batteries & certificate of conformity
Inclusions per HVAC Shop listing.
Specifications
| Item | Detail |
|---|---|
| Measuring range | −50 to +400 °C (−58 to +752 °F) |
| Accuracy | Up to ±1.0 °C in −30 to +80 °C; see data sheet for full curve |
| Resolution | 0.1 °C / 0.1 °F |
| Response (t) | ≈ 3 s (flex probe) |
| Bluetooth range | Up to 100 m (328 ft) line-of-sight |
| Battery / life | 3×AAA / up to ~150 h |
| Operating temp | −20 to +50 °C |
| Protection | IP40 housing |
| Handle size / weight | 129 × 31 × 31 mm / ~88 g |
| Probe cable | ≈800 mm fibreglass-coated cable |
Specs verified against Testo documentation and HVAC Shop page.
Warranty & Returns
Backed by manufacturer’s warranty. For AU delivery windows and returns, see Shipping & Returns.
Instruction & Manuals
FAQs
Does the 915i work with third-party Type K probes?
Yes—the handle accepts common Type K thermocouples; lockable connection for Testo plug-ins.
How far can I monitor readings?
Up to ~100 m (line-of-sight) via Bluetooth to the Testo Smart App.
Can it integrate with Testo gauges?
Yes—pairs in the Smart App and works alongside instruments like the Testo 550s/557s.
Battery life on site?
Up to ~150 hours on AAA cells (typical, backlight/app use dependent).
Related Products
- Need a full temp kit? The Testo 915i Temperature Kit adds surface and air probes in a tidy case—handy for commissioning.
- Pair with smart gauges: Testo 557s Manifold for wireless pressure/temps and app reports—work smarter, not harder.
- Prefer a compact gauge? The Testo 550i Smart-Kit keeps everything on your phone for quick service calls.
See the official Testo 915i product page for specifications, probe options and Smart App details.