HydroLightno

### Checklist - [X] I can reproduce the bug with the latest version given [here](https://github.com/FossifyOrg/Calculator/releases/latest). - [X] I made sure that there are **no existing issues** - [open](https://github.com/FossifyOrg/Calculator/issues) or [closed](https://github.com/FossifyOrg/Calculator/issues?q=is%3Aissue+is%3Aclosed)...