Uni-T UT661D Pipeline Blockage DetectorUni T UT661D Pipe Blockage Detector The Uni T UT661D is a pipe blockage detector designed for quickly locating blockages in pipes without the need to dismantle the system. The device works with both plastic and metal pipes, and the 35 meter signal cable allows for inspection of longer sections. A maximum detection depth of up to 50 cm allows for effective blockage detection even in hard to reach areas. The kit consists of a transmitter and receiver