Reference and calculations for thermocouples
About this app
Thermocouples is a reference guide to get general information on thermocouples for all those in the industry that regularly deal with thermal sensors. This handy app features the colour codes for a wide range of thermocouples in a wide range of standards on easy to see images. The shown standards are IEC, BS, ANSI, NFE, DIN, and JIS. The included thermocouples are B, E, J, K, N, R, S, T, U, Vx.
Main features: * Shows thermocouples colours for 10 thermocouples across 6 standards. * Information on range, conductor materials and compensates. * Search thermocouples by conductor colours to find type and colour code. * Temperature converter with °C, °F and K. * Cold junction °C to mV calculator. * Modern design. * Open-source via the MIT licence. * mV to °C converter using NIST values for main thermocouple types.
Thermocouples is open source. The source can be found at: https://codeberg.org/danb/Thermocouples Feel free to create a pull request or open issues there.
This app is 100% free with no "upgrade", "pro" or "unlocked" versions. This app requires no permissions and does not use any user data.
Remarks: This application is for quick reference use only, there may be errors or inaccuracies although I try to ensure the information is as accurate as possible. Me, the app maker, or the company advertised, STS, will not be held liable for any misinformation or misjudgement as a result of using this app.
Licensed under MIT, by Dan Brown.
What's New in v4.0.3
Imported from the F-Droid repository index.
- * Added metadata for Fdroid.
- * Updated layout to avoid overlapping with system bars.
- * Updated styles to use light status bar to avoid issue with invisible status bar text.
Version history
Sep 29, 2025 · 6 MB · Android API 26–36 · code 17
Imported from the F-Droid repository index.
- * Added metadata for Fdroid.
- * Updated layout to avoid overlapping with system bars.
- * Updated styles to use light status bar to avoid issue with invisible status bar text.
SHA-256 3a4d4213f1d529d65e376e250d5670d793e5902821014574116599070030b962
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
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How to roll back to an earlier version
No earlier build is on record for Thermocouples, so there is nothing to roll back to yet. When a second version is published, this section will explain how to move between them safely.
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Get Thermocouples
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Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
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SHA-256 Hash
3a4d4213f1d529d65e376e250d5670d793e5902821014574116599070030b962
Signing certificate
fb6b1e78653bdacced16df6fa142a81930f944708db00177301e9d5aa7c41e3e
Permissions Required
What each permission lets Thermocouples do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
No earlier build is on record — this is the first release we have listed.
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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