If you are looking for a specific build like 339, it is likely available on third-party APK mirrors, but standard versions are available on official platforms:
: Supports conversions across 35 different categories, including unit and currency conversions. Download and Version Safety Download Tech Calc build 339 apk
: Always verify the safety of a downloaded APK. Official versions on Google Play use encryption in transit and disclose data sharing practices (such as sharing Device IDs with third parties). If you are looking for a specific build