This handheld sludge blanket level detector allows water/wastewater plant operators to easily measure liquid-solids interface levels in clarifiers, tanks and lagoons, helping to prevent carryover, monitor for regulatory compliance and eliminate unnecessary pumping and dredging. Compact and weatherproof, the Sludge Gun® is ideal for use on catwalks and boats. Users quickly determine sludge depth readings from numbered markers on the cable. A thumb-adjustable control allows the user to fine-tune the instrument’s optical sensitivity, enabling it to detect silt, sludge and biosolids in densities ranging from clear surfaces or light flocs to the thick blankets of murky lagoons.