Charm has the only B.st Disc Assay officially approved for bulk tank milk.

The Kidney Inhibition Swab (KIS) is a simple to use inhibition test for screening broad-spectrum antimicrobial drugs in fresh or thawed kidney tissue.

The Charm Blue Yellow II Test is a microbial inhibition assay, which detects inhibitors in milk. The test consists of a single service well that contains pre-measured bacterial spores,* media, and a pH indicator.  

The Charm CowSide^® II Test is a microbial inhibition assay that detects inhibitors in milk.
The CowSide II consists of a single service vial that contains pre-measured bacterial spores, media and a pH indicator.