Testo 605i Smartphone Thermohygrometer

A. Product Overview

The Testo 605i is a smartphone-operated thermohygrometer from the Testo Smart Probes series. It is designed for professional measurement of air temperature and relative humidity in indoor spaces, air-conditioning systems and ventilation ducts.

The instrument does not require a conventional built-in display. Measurement values are transmitted through Bluetooth to a smartphone or tablet running the Testo Smart App. The app displays the readings in numerical, table or graphical form and can generate measurement reports in PDF or Excel format.

The bendable probe head allows the sensor to be positioned conveniently inside ventilation ducts and other difficult-to-access measuring points.

Key Features

• Measures air temperature and relative humidity
• Suitable for rooms and ventilation ducts
• Automatic calculation of dew point temperature
• Automatic calculation of wet bulb temperature
• Bluetooth communication range of up to 100 metres
• Bendable probe head for convenient duct measurement
• Displays readings through the Testo Smart App
• Measurement data can be viewed as tables or graphs
• Reports can include photographs and comments
• Reports can be shared directly by email
• Compatible with iOS and Android devices

Main Technical Specifications

Product: Testo 605i Smartphone Thermohygrometer
Order number: 0560 2605 02
Humidity sensor: Capacitive
Humidity measuring range: 0 to 100 percent relative humidity
Humidity resolution: 0.1 percent relative humidity
Temperature sensor: NTC
Temperature measuring range: Minus 20 °C to 60 °C
Temperature resolution: 0.1 °C
Operating temperature: Minus 20 °C to 50 °C
Bluetooth range: Up to 100 metres
Battery type: Three AAA batteries
Battery life: Approximately 150 hours
Probe shaft length: 73 millimetres
Dimensions: 218 by 30 by 25 millimetres

B. Working Principle

The Testo 605i uses two integrated sensing technologies to measure indoor air conditions.

The capacitive humidity sensor measures relative humidity by detecting changes in the electrical properties of its humidity-sensitive material. As the moisture level in the surrounding air changes, the electrical capacitance of the sensor changes. The instrument converts this variation into a relative humidity reading.

The integrated NTC temperature sensor measures air temperature. The electrical resistance of the NTC sensor changes according to the surrounding temperature. The instrument processes this resistance change and converts it into a temperature value.

The measured temperature and humidity data are transmitted through Bluetooth to the Testo Smart App installed on a compatible smartphone or tablet. The app uses these measurements to automatically calculate additional parameters such as dew point and wet bulb temperature.

The readings can be viewed in real time, recorded for analysis and included in professional measurement reports. When used together with the Testo 405i thermal anemometer, the system can also support the determination of heating and cooling output.

C. Why Is the Testo 605i Used?

The Testo 605i is used to evaluate temperature and humidity conditions in HVAC systems, indoor environments and ventilation ducts. Accurate humidity and temperature measurements are important for maintaining comfort, protecting materials, improving ventilation performance and identifying conditions that may cause condensation or mould.

Common Reasons for Using the Testo 605i

HVAC system inspection:
Technicians can measure air temperature and humidity during installation, commissioning and maintenance of heating, ventilation and air-conditioning systems.

Ventilation duct measurement:
The bendable probe head can be positioned inside ducts to obtain air temperature and relative humidity readings.

Indoor climate evaluation:
The instrument helps evaluate environmental conditions in offices, laboratories, warehouses, production areas and commercial buildings.

Dew point assessment:
Automatic dew point calculation helps identify when moisture may begin to condense on surfaces.

Wet bulb temperature measurement:
Wet bulb temperature is useful for assessing evaporative cooling conditions and analysing air-conditioning performance.

Mould risk investigation:
Temperature and humidity readings can help technicians identify environmental conditions that may encourage mould formation.

Measurement documentation:
The Testo Smart App allows readings, photographs, comments and customer information to be included in digital reports.

Measurements at distant locations:
The Bluetooth range of up to 100 metres allows readings to be viewed without remaining directly beside the measuring point.

D. Suitable Buyers

The Testo 605i Smartphone Thermohygrometer is suitable for:

• HVAC installation and maintenance technicians
• Air-conditioning service engineers
• Ventilation system contractors
• Building maintenance companies
• Facility management professionals
• Indoor air quality consultants
• Energy auditors
• Refrigeration service professionals
• Environmental monitoring companies
• Building inspection professionals
• Industrial maintenance teams
• Pharmaceutical and laboratory maintenance departments
• Warehousing and storage facility operators
• Commercial property management companies
• Technical training institutes
• Test and measurement instrument suppliers

Frequently Asked Questions

1. What does the Testo 605i measure?

The Testo 605i measures air temperature and relative humidity. The Testo Smart App also calculates dew point and wet bulb temperature automatically.

2. Can the Testo 605i be used inside ventilation ducts?

Yes. The instrument is designed for measuring temperature and humidity in rooms and ventilation ducts. Its bendable probe head helps position the sensor conveniently inside a duct.

3. Does the Testo 605i have a built-in display?

No. The instrument uses a compatible smartphone or tablet as its display. Measurement values are transmitted through Bluetooth and shown in the Testo Smart App.

4. What is the temperature measuring range of the Testo 605i?

The temperature measuring range is minus 20 °C to 60 °C.

5. What is the humidity measuring range?

The humidity measuring range is 0 to 100 percent relative humidity.

6. What is the Bluetooth range of the Testo 605i?

The Bluetooth communication range is up to 100 metres under suitable operating conditions.

7. Does the instrument calculate dew point?

Yes. The Testo Smart App automatically calculates dew point temperature using the measured air temperature and relative humidity values.

8. Can it calculate wet bulb temperature?

Yes. Wet bulb temperature is calculated automatically through the Testo Smart App.

9. Can measurement reports be created?

Yes. Measurement data can be presented as graphs or tables. Users can add photographs and comments and create reports that can be shared by email in PDF or Excel format.

10. Which mobile devices are compatible with the Testo 605i?

The datasheet specifies compatibility with devices running iOS 11 or newer or Android 6 or newer. The mobile device must also support Bluetooth 4.0.

11. What batteries are used in the Testo 605i?

The instrument operates using three AAA batteries.

12. What is the approximate battery life?

The stated battery life is approximately 150 hours, depending on operating conditions and usage.

13. Can the Testo 605i measure heating and cooling output?

When used together with the Testo 405i thermal anemometer, the measurement system can support the determination of heating and cooling output.

14. Is the Testo 605i suitable for indoor air quality testing?

It is suitable for measuring two important indoor climate parameters: air temperature and relative humidity. For complete indoor air quality analysis involving carbon dioxide, particulate matter or other pollutants, additional instruments may be required.

15. What is included with the Testo 605i?

According to the datasheet, the Testo 605i is supplied with batteries and a calibration protocol.