Hardy Diagnostics is an American company that manufactures and sells bacteriological culture media, reagents, and rapid identification kits for microbiological testing in clinical, research, and industrial laboratories. Founded by Jay Hardy in 1980 and headquartered in Santa Maria, California, Hardy Diagnostics is the third-largest manufacturer of culture media in the United States, manufacturing more than 2,700 different media products. Hardy Diagnostics was recognized by Inc.