Renewing biometrics to extend the validity of an approved tourist visa typically depends on the specific country's visa policies. Most countries do not allow the extension of a visa simply by renewing biometrics. Instead, you would generally need to apply for a new visa if your current visa is about to expire. However, some countries may have specific provisions or processes in place for extending visas.
To get the most accurate information, it's best to:
1. **Check the official website** of the embassy or consulate of the country that issued your visa.
2. **Contact the embassy or consulate directly** for detailed instructions and requirements.
3. **Review any specific instructions** related to your visa type, as some visas may have different rules regarding extensions and biometrics.
If you provide the country in question, I can look up more specific details for you.