Testo 805i Smartphone Infrared Thermometer
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A. Product Overview
The Testo 805i Smartphone Infrared Thermometer is a professional non-contact temperature measuring instrument from the Testo Smart Probes range. It is designed to measure surface temperature without touching the object being tested.
Instead of using a built-in display, the Testo 805i connects wirelessly to a compatible smartphone or tablet through Bluetooth. Measurement values are displayed and analysed in the Testo Smart App.
The instrument is suitable for checking wall surfaces, electrical fuses, circuit breakers, motors, ducts, ventilation outlets and components used in air-conditioning and refrigeration systems. Its compact construction makes it convenient for service technicians, maintenance engineers and field inspection work.
Main Product Features
- Product model: Testo 805i
- Order number: 0560 1805
- Measurement method: Non-contact infrared measurement
- Measuring range: Minus 30 to 250°C
- Resolution: 0.1°C
- Optical ratio: 10:1
- Laser marking: Eight-point laser circle
- Adjustable emissivity: 0.10 to 1.00
- Operating temperature: Minus 10 to 50°C
- Storage temperature: Minus 20 to 60°C
- Battery type: Three AAA batteries
- Approximate battery life: 30 hours
- Dimensions: 140 by 36 by 25 mm
- Smartphone and tablet operation through Bluetooth
- Compatible with the Testo Smart App
- Includes batteries and calibration protocol
The laser circle helps the user identify the approximate measurement area instead of relying on a single laser point. This makes surface temperature checks easier and more controlled.
B. Working Principle
The Testo 805i works using infrared temperature measurement technology.
Every surface emits infrared radiation according to its temperature. The infrared sensor inside the Testo 805i detects this radiation and converts it into an electrical signal. The instrument then calculates the corresponding surface temperature.
The measurement process works as follows:
- Switch on the Testo 805i.
- Open the Testo Smart App on a compatible smartphone or tablet.
- Connect the instrument through Bluetooth.
- Aim the thermometer at the required surface.
- Use the eight-point laser circle to identify the measurement area.
- Maintain an appropriate distance according to the 10:1 optical ratio.
- View the surface temperature reading in the Testo Smart App.
- Save the measurement and add photographs, comments or customer information when required.
- Generate and share the measurement report.
Because the measurement is non-contact, the instrument does not need to touch hot, moving, electrically active or difficult-to-reach surfaces.
Understanding the 10:1 Optical Ratio
The 10:1 distance-to-spot ratio means that the measurement spot becomes larger as the distance from the surface increases.
For example, at a distance of approximately 1 metre, the measuring spot is approximately 100 mm in diameter. For greater accuracy, the target surface should be larger than the complete measurement spot.
Understanding Emissivity
Emissivity describes how effectively a surface emits infrared energy. The Testo 805i allows emissivity adjustment from 0.10 to 1.00.
Materials such as painted surfaces, rubber, wood and many non-metallic materials generally have higher emissivity. Shiny metals generally have lower emissivity and may require careful adjustment or surface preparation for reliable readings.
C. Why It Is Used
Non-Contact Temperature Measurement
The Testo 805i measures surface temperature without touching the object. This is useful when the surface is hot, moving, electrically energised, contaminated or difficult to access.
Fast Inspection
Temperature readings can be taken quickly by aiming the instrument at the required surface. This helps technicians inspect multiple components efficiently.
Safer Measurement
The non-contact method allows technicians to maintain a safer distance from hot equipment, electrical components and operating machinery.
Clear Measurement Area Identification
The eight-point laser circle marks the approximate measurement area, helping the user position the thermometer correctly.
Smartphone-Based Operation
The Testo Smart App turns a smartphone or tablet into the instrument display. Users can view readings clearly and control measurement functions wirelessly.
Digital Documentation
The app allows users to save measurement results, add photographs and comments, create customer-specific reports and send the documentation electronically.
Detection of Temperature Differences
The Testo 805i can help identify unusual hot or cold areas on walls, electrical components, HVAC systems and mechanical equipment.
Mould-Risk Assessment
The Testo Smart App includes a dedicated measurement menu that can assist in identifying wall areas where surface conditions may indicate a risk of mould formation. The assessment should be supported by appropriate ambient temperature and humidity measurements.
D. Suitable Buyers
The Testo 805i Smartphone Infrared Thermometer is suitable for:
- HVAC service technicians
- Refrigeration technicians
- Electrical maintenance engineers
- Facility management teams
- Building inspection professionals
- Energy auditors
- Industrial maintenance departments
- Mechanical maintenance engineers
- Air-conditioning service contractors
- Property maintenance companies
- Quality-control teams
- Electrical panel manufacturers
- Building automation professionals
- Cold-storage maintenance teams
- Technical service centres
- Industrial instrumentation suppliers
- Training institutes and technical laboratories
It is especially useful for professionals who require portable non-contact temperature measurement combined with smartphone-based documentation.
Frequently Asked Questions
1. What is the Testo 805i?
The Testo 805i is a smartphone-operated infrared thermometer designed for non-contact surface temperature measurement.
2. What is the order number of the Testo 805i?
The order number is 0560 1805.
3. What is the measuring range of the Testo 805i?
It measures surface temperatures from minus 30 to 250°C.
4. Does the Testo 805i require contact with the surface?
No. It measures temperature remotely by detecting infrared radiation emitted by the surface.
5. Does the Testo 805i have a built-in display?
The measurement values are primarily displayed through the Testo Smart App on a compatible smartphone or tablet.
6. How does the Testo 805i connect to a smartphone?
It connects wirelessly through Bluetooth.
7. What is the purpose of the eight-point laser circle?
The laser circle marks the approximate surface area being measured and helps the user aim the thermometer correctly.
8. What does the 10:1 optical ratio mean?
It means the distance from the thermometer to the target is approximately ten times the diameter of the measurement spot.
9. Can the Testo 805i measure wall temperature?
Yes. It is suitable for checking wall and building-surface temperatures.
10. Can it measure electrical components?
Yes. It can be used for non-contact temperature checks on fuses, circuit breakers, electrical components and control-panel equipment, provided safe working practices are followed.
11. Is the Testo 805i suitable for HVAC applications?
Yes. It can measure surface temperatures on ducts, registers, air-conditioning components, refrigeration equipment and related HVAC systems.
12. Can the Testo 805i measure motor temperature?
Yes. It can be used to check accessible motor-surface temperatures without direct contact.
13. Can it measure internal temperature?
No. Infrared thermometers measure surface temperature only. They do not measure the internal temperature of an object or material.
14. Can the Testo 805i measure through glass?
Generally, an infrared thermometer measures the surface temperature of the glass rather than the temperature of an object behind it.
15. Can it measure shiny metal surfaces accurately?
Shiny metal surfaces can produce inaccurate infrared readings because of their low emissivity and reflected radiation. Emissivity may need to be adjusted, or the surface may need suitable preparation.
16. Is emissivity adjustable?
Yes. The emissivity setting can be adjusted from 0.10 to 1.00.
17. What is the measurement resolution?
The resolution is 0.1°C.
18. What type of batteries does it use?
It uses three AAA batteries.
19. What is the approximate battery life?
The specified battery life is approximately 30 hours.
20. What can be done through the Testo Smart App?
The app can display readings, control measurements, save results, add photographs and comments, create measurement reports and send reports electronically.
21. Can the Testo 805i help identify mould-risk areas?
Yes. The Testo Smart App includes a measurement menu intended to simplify the identification and documentation of potential mould-risk areas.
22. Is a smartphone included with the Testo 805i?
No. A compatible smartphone or tablet must be arranged separately.
23. What is included in the standard package?
The standard package includes the Testo 805i infrared thermometer, batteries and a calibration protocol.
24. Is a calibration certificate available?
An ISO calibration certificate for infrared temperature measurement is available as an optional accessory.
25. Is the Testo 805i suitable for professional use?
Yes. It is intended for professional HVAC, electrical, building inspection, maintenance and industrial surface-temperature measurement applications.