FLIR ONE Pro LT iOS Pro-Grade Thermal Camera for Smartphones

Published on Aug. 2, 2023, 12:19 p.m.

Thermal imaging technology is a crucial tool that allows us to observe and measure the thermal radiation of objects, revealing hidden issues that may not be visible to the naked eye. Through thermal imaging cameras, thermal distributions of objects can be converted into visible images, helping users identify potential faults or anomalies. This article will delve into the FLIR ONE Pro LT iOS, a powerful thermal imaging camera that offers convenient smartphone connectivity, enabling quick and reliable thermal imaging inspections in various fields such as construction, electrical, maintenance, and more.

The FLIR ONE Pro LT iOS is a powerful thermal imaging camera that attaches to your iPhone, allowing you to see and measure heat signatures that are invisible to the naked eye. As a pro-grade accessory designed for building inspection, restoration, HVAC, and electrical applications, the FLIR ONE Pro LT provides thermal imaging capabilities and temperature measurement tools to help diagnose hidden issues quickly and reliably.



The FLIR ONE Pro LT features a compact, lightweight design with an adjustable connector that extends up to 4mm, so you can attach it securely to your iPhone even while it’s inside a protective case. It has a thermal resolution of 80 x 60 pixels and temperature measurement range from -20°C to 120°C (-4°F to 248°F).

Unique image processing from FLIR enhances thermal image resolution and accuracy. When combined with MSX technology that overlays visual details onto the thermal images, the FLIR ONE Pro LT produces exceptionally clear thermal images that make it easier to identify potential problems.

Key Features:

  • 80 x 60 Thermal Resolution
  • MSX Image Enhancement
  • OneFit Adjustable Connector
  • 1440 x 1080 Visual Camera
  • FLIR VividIR Image Processing
  • Multiple Measurement Tools
  • FLIR Tools Mobile App

Technical Background

Thermal imaging technology utilizes the infrared radiation emitted by objects to generate images, which is closely related to the temperature of the object. Thermal imaging cameras detect this infrared radiation and convert it into visible images, allowing users to observe the temperature distribution of objects. As a professional-grade thermal imaging camera, the FLIR ONE Pro LT iOS features excellent image processing technology and precise temperature measurement capabilities, enabling the quick detection of potential issues in various scenarios.


Design and Usability

The adjustable OneFit connector is a brilliant design feature that provides a secure connection to your smartphone, even if it’s in a thick protective case. The connector extends and locks into place for a custom fit.

Despite its powerful imaging capabilities, the FLIR ONE Pro LT remains compact and lightweight at just 37g. It charges quickly via USB-C and provides around 1 hour of battery life per charge. The intuitive mobile app simplifies operation with all key controls and tools easily accessible.

Features and Image Quality

With a thermal sensitivity of 100mK, the FLIR ONE Pro LT can detect subtle temperature differences to uncover issues like missing insulation, air leaks, moisture intrusion, and more. The 1440 x 1080 visual camera provides reference images that can be blended with the thermal images.

VividIR image processing gives the 80 x 60 thermal images remarkable clarity and detail. You can adjust level and span controls, add spot meters, and manipulate color palettes to pinpoint areas of interest. Images and data can be conveniently captured, stored, and shared from the FLIR Tools Mobile app.

Technical Parameter Analysis


The resolution of a thermal imaging camera refers to the smallest temperature difference that can be distinguished in its images. The FLIR ONE Pro LT iOS features a thermal resolution of 80 x 60 pixels, meaning it can detect smaller temperature changes, thus providing more detailed thermal images. Higher resolution helps users to identify and locate problem areas more accurately.


The sensitivity of a thermal imaging camera indicates the smallest temperature difference it can detect. The FLIR ONE Pro LT iOS has a sensitivity of 100mK, meaning it can detect minute temperature changes, even in situations with small temperature differences, producing clear images. High sensitivity improves the detection capabilities of the thermal imaging camera, allowing it to uncover hidden issues.

Temperature Range

The temperature range of a thermal imaging camera indicates the range of temperatures it can accurately measure. The FLIR ONE Pro LT iOS has a temperature range of -20°C to 120°C (-4°F to 248°F), suitable for most common applications. Its wide temperature range enables it to reliably operate in various environments, meeting the diverse needs of users.


This professional-grade thermal camera truly shines for building diagnostics. Easily scan for insulation deficiencies, locate moisture and water damage, find HVAC issues like leaky ductwork, and detect electrical overloads or connection problems. FLIR’s signature image quality allows you to thoroughly inspect properties and create professional reports to document thermal findings.

Use Cases:

  • Finding insulation gaps, air leaks, moisture intrusion
  • Locating HVAC issues in ductwork, vents, condensers
  • Detecting electrical overloads and connection problems
  • Identifying water damage and drying progress
  • Performing home energy audits
  • Scanning roofs and building envelopes

Reviews and User Feedback

The FLIR One Pro LT iOS thermal imaging camera has garnered a significant amount of feedback from users worldwide. Here’s an analysis of the key points highlighted in the reviews:

  1. Performance and Functionality:
  2. Users generally find the FLIR One Pro LT iOS to be effective in various applications, including electrical inspection, building inspection, restoration, and HVAC maintenance.
  3. The thermal resolution of 80 x 60 pixels, combined with FLIR’s VividIR image processing technology, is praised for providing clear and accurate thermal images.
  4. The adjustable OneFit connector is appreciated for its convenience, allowing users to securely attach the camera to their smartphones even while they’re in protective cases.

  5. Battery Life and Durability:

  6. While the camera’s performance is generally well-received, some users express concerns about its battery life. Several users report that the battery life is relatively short, with an average of around 30 minutes per charge.
  7. There are also mentions of durability issues, with some users experiencing battery and cover damage over time, leading to decreased usability.

  8. Ease of Use and Compatibility:

  9. Users find the FLIR One Pro LT iOS easy to use, particularly when paired with the FLIR Tools Mobile App, which offers features such as multiple spot meters and level/span controls.
  10. Compatibility with iOS smartphones is highlighted as a key feature, enabling seamless integration with Apple devices.

  11. Value for Money:

  12. Opinions regarding the value for money vary among users. While some consider the FLIR One Pro LT iOS to be a worthwhile investment, citing its ability to identify various issues accurately, others express concerns about its relatively high price compared to similar products on the market.

  13. Customer Support and Service:

  14. There are mixed reviews regarding customer support and service. While some users appreciate the assistance they received from FLIR’s customer service team, others report dissatisfaction with the handling of warranty claims and product replacements.

Overall, the FLIR One Pro LT iOS thermal imaging camera receives positive feedback for its performance, functionality, and ease of use, despite some concerns regarding battery life and durability. As with any product, individual experiences may vary, but the general consensus is that the FLIR One Pro LT iOS is a capable tool for various thermal imaging applications.

Pros and Cons

- Excellent image quality
- Easy to connect to phones
- Intuitive mobile app
- Helps diagnose issues quickly
- Great value for performance

- Short battery life
- Lower thermal resolution than premium models


  • MSRP: $349.99
  • Current Amazon Price: $297.50


Conclusion and Recommendation

For homeowners and professionals seeking an affordable, high-quality thermal imaging camera, the FLIR ONE Pro LT is an excellent choice. It produces superb thermal images, has an ingenious adjustable connector, and empowers you to quickly locate hidden issues and reduce diagnostic guesswork. If you don’t mind occasionally recharging during longer inspections, the FLIR ONE Pro LT delivers pro-grade thermal capabilities at a fraction of the cost of full-sized thermal cameras. It provides invaluable visual insights for building diagnostics and is highly recommended for anyone who needs to “see the heat” in order to do their job.


  • Thermal Resolution: 80 × 60 pixels
  • Temperature Range: -20°C to 120°C (-4°F to 248°F)
  • Thermal Sensitivity: 100 mK
  • Visual Resolution: 1440 × 1080
  • Dimensions: 68 × 34 × 14 mm
  • Weight: 37g
  • Battery Life: ~60 minutes
  • Charge Time: 40 minutes
  • Mobile App: FLIR Tools
  • Warranty : 1 year limited warranty

What’s Included

  • FLIR ONE Pro LT camera
  • USB-C charging cable
  • Storage case

Getting Started:

  1. Fully charge the FLIR ONE Pro LT
  2. Download the FLIR Tools Mobile app
  3. Attach the camera to your phone using the adjustable connector
  4. Open the app and start scanning! Review live thermal video feed and capture images.
  5. Adjust color palettes, measurement tools, and image settings as needed.