An infrared temperature range describes which temperatures a sensor is intended to report; it does not establish measurement accuracy, target suitability or the phone's operating temperature. Before buying a phone for temperature work, confirm the sensor type, its documented limits and the intended inspection task.
Distinguish three capabilities
| Capability | Question it addresses |
|---|---|
| Spot infrared measurement | What temperature is reported for the measured area? |
| Thermal imaging | Where are temperature differences visible across the scene? |
| Night vision | Can an image of the scene be captured in low light? |
The current Phonemax R4 GT listing describes thermal imaging and night vision. The R4-T lists a night-vision camera; that feature alone is not evidence of temperature measurement. Confirm the selected model and sensor instead of relying on similar names.
What does a -20°C to 100°C label leave unanswered?
It leaves accuracy, repeatability, usable distance, target size, adjustment options and calibration evidence unresolved. This guide does not verify that range for either model. Request the current sensor specification and clarify whether stated accuracy applies across the whole range or only under defined conditions.
Why the surface matters
FLIR's measurement documentation identifies emissivity and reflected temperature as important parameters. A displayed number therefore needs context: surface finish and reflections can affect interpretation. FLIR's instructions describe its equipment and are not evidence that a Phonemax app offers identical controls.
Keep a repeatable inspection record
- Identify the equipment and exact surface being viewed.
- Record the operating condition of the equipment and the viewing position.
- Save the image or reading with the available sensor settings and date.
- Compare with an appropriate reference method when the decision requires a dependable numerical result.
These are proposed documentation steps, not a calibration procedure or a record of tested Phonemax accuracy. A thermal image can support an inspection conversation, but it should not be presented as a verified defect diagnosis on its own.
Start with the measurement question
Tell Phonemax what material you need to observe, the expected temperature, the working distance and the decision the result will support. Ask for the exact sensor evidence before selecting a temperature phone.
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