Only the current version so far — new entries appear as the app ships updates.
Hardness Unit Converter is a tools app by Akikibai-Laboratory with 5,000+ downloads (about 8.3K estimated). +15 installs in the last 7 days. Released Feb 4, 2022. Install growth, rank history, SDKs and ad networks.
From the store listing: “Converts hardness units such as Vickers hardness and Rockwell hardness.”
