Erba (NYSE: ERB), a diagnostics company, has acquired a unit of Escalon Medical Corp. for $6.5 million.

Wayne, Pa.-based Escalon sold its clinical diagnostics business, which develops instruments for physician office labs, small hospital labs and veterinary research labs.

Erba Diagnostics Inc., headquartered in Miami, develops, manufactures and distributes test kits and instruments for autoimmune and infectious diseases.