This Bitrex test solution comes in glass ampules with a pre-drilled plastic cap. The ampules contain 2.5 cc of solution that averages 3 to 5 fit tests per tube. It is for use with a bitter qualitative fit test kit. There are six bitter test solution ampules in a box.
Sold at Grainger @ $37 each box!
https://www.grainger.ca/en/product/FIT-TESTING-SOLUTION-2-5-CC-BITREX-PK6/p/ALO2041-12K