Testo 605i Smart Thermohygrometer – Bluetooth Temperature & Humidity Probe

The Testo 605i is a compact Bluetooth thermohygrometer that puts professional temperature and humidity measurement in your shirt pocket. Pair it with the free testo Smart Probes App on your smartphone or tablet and get live readings of air temperature, relative humidity, dew point, and wet bulb — all logged and ready to export as a PDF report on the spot.

Designed for HVAC technicians working on air conditioning, ventilation, and refrigeration systems, the 605i is part of the Testo Smart Probes range — a modular system of wireless probes that work together through a single app. Use it alongside the Testo 115i clamp thermometer for complete system diagnostics.

Key Features

• Bluetooth connectivity — pairs with the testo Smart Probes App (iOS & Android)
• Measures air temperature, relative humidity, dew point, and wet bulb temperature
• Temperature range: -20 to +60°C | Accuracy: ±0.5°C
• Humidity range: 0 to 100% RH | Accuracy: ±2% RH (10–90% RH)
• Live readings, min/max/average, and trend graphs via app
• Generate and share PDF reports directly from your smartphone
• IP54 rated — dust and splash resistant for field use
• Long battery life — AAA batteries, up to 40 hours

Ideal Applications

• Room and duct humidity assessment
• Dew point and condensation risk checks
• Air conditioning commissioning and servicing
• Ventilation system balancing and IAQ reporting
• Cold room and refrigeration environment monitoring

Specifications

• Temperature range: -20 to +60°C | Accuracy: ±0.5°C | Resolution: 0.1°C
• Humidity range: 0 to 100% RH | Accuracy: ±2% RH (10–90% RH) | Resolution: 0.1% RH
• Dew point / Wet bulb: Calculated from temp & RH
• Battery: 2 x AAA | Battery life: ~40 hours
• Operating temperature: -20 to +60°C
• Protection class: IP54
• Dimensions: 125 x 29 x 29 mm | Weight: 60g

In the Box

• Testo 605i smart thermohygrometer probe
• 2 x AAA batteries
• Certificate of conformity

Browse the full Testo HVAC instruments range or explore all digital hygrometers and humidity meters at HVAC Shop AU.