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