- For training to healthcare professionals who conduct virus testing for the first time 1. When swab reaches the right position in the nasal cavity, the swab will be pigmented in blue 2. Ways to use tongue depressor with swabs can be practiced. 3. The shape of nasal cavity between right and left are different. 4. The product comes with cross sectional model Set includes: 1 main model, 1 cross sectional model, 1 syringe (30ml), 1 disposable cup, 10 swabs for coloring, 1 storage case, 6 replacement pads manual