Check the mouse manufacturer’s software
Look for DPI settings in the mouse utility or control app
Check the mouse packaging or product manual
Search the model number on the manufacturer’s website
Use the DPI button on the mouse if it has one
Test cursor movement against a known screen distance
Use an online DPI analyzer tool
Check Windows mouse settings for pointer speed, not exact DPI
Check macOS mouse settings for pointer speed, not exact DPI
Contact the manufacturer’s support team