... the recycling auto-alarm function Automatic Kjeldahl Nitrogen Determination System Model: ZDDN-IIProduct introduction: It is also called Automatic ... testing nitrogen contains in grain, food, dairy products, drink, animal food, soil, medicine, settling, chemical and others. The test ... : 1. Test varieties: grain, food, dairy products, drink, animal food, soil, medicine, settling, chemical and so on.2. ...