Antibiotic tests are performed at each step of the milk collection and processing. Thermostatic devices are used in the farms so producers can control the quality of milk and avoid rejection by milk collecting center. Dry incubators are used to check if milk tanks, tank trucks or silos are free from any antibiotic substance. And in dairies and milk plants antibiotic tests, together with thermostatic devices, help to control the quality of milk used for the production of dairy products.