Getting the right font-size on every mobile device

Question

In my mobile app I use kind of big fonts for example:

text

When I test it on

Answer 1

Use @media Queries and set different fonts for different resolutions

Example

@media all and (max-width: 1200px) and (min-width: 800px) {
                    /* Change Resolutions Here */
  b {
    font-size: 12px;
  }
}

Good Read On Media Queries