This handheld detector from Markland Specialty Engineering measures wastewater sludge interface levels in clarifiers, tanks and lagoons and helps provide valuable sludge level profiles. It allows users to eliminate unnecessary pumping/dredging, monitor sludge bed depth for regulatory compliance and prevention of carryover and optimize sludge density. The Sludge Gun® uses high-intensity infrared light to locate both the sludge blanket and overlying cloudy layer in concentrations ranging from light flocs to thick blankets. It's compact, weatherproof and convenient for use on boats and catwalks. No calibration required.