Abstract: The invention is a portable laboratory instrument that incorporates software designed to record laboratory tests results to analyze the biomass of a Wastewater Treatment Plant (WWTP) using an Activated Sludge Process. The software uses the values entered by the user and its data bank/algorithms to determine the health/age of the biomass. It produces an interpretation of the collected data, and delivers a final set of instructions based on the overall health of the Wastewater Treatment Plant (WWTP). The final result is delivered using simple instructions and color coded lights for an easy and quick interpretation. Its use does not require extensive training in the field of wastewater treatment. Its purpose is to prevent environmental disasters by detecting current/future biological problems.