For removing heavy soiling from test tubes by scraping. With 5 mm boring for rod.

Brushes for test tubes
Test tubes brushes
Test tubes cleaner
Brushes for test tubes
Test tubes brushes
Test tubes cleaner
Brushes for test tubes
Test tubes brushes
Test tubes cleaner
Brushes for test tubes
Test tubes brushes
Test tubes cleaner
Brushes for test tubes
Test tubes brushes
Test tubes cleaner