The patented IPUS Nanobag rapid analysis delivers all important informations on chatacteristics of the anaerobic digestion process of the biogas plant, in timely and reliable manner. In a sample of digested residue or manure the pH value, total nitrogen, ammonium, volatile fatty acids as well as the nutrients K, P, Ca, Mg and even urea (from manure) are determined. The odor-free and stabilized sample can be sent simply by post, the report is ready after 2-3 working days.