According to the prescribed specifications, the NLJD should be capable of detecting ABCD circuit buried under dry soil up to a depth of at least

A Non-Linear Junction Detector (NLJD) is an electronic device used to detect hidden electronic circuits (semiconductor junctions) regardless of whether they are switched on or off. In India, the Ministry of Home Affairs (MHA) defines the Qualitative Requirements (QRs) for security equipment used by police and paramilitary forces. According to these prescribed specifications, a standard handheld NLJD must be capable of detecting a standard ABCD circuit (a benchmark test target containing semiconductor components) buried under dry soil at a depth of at least 18 inches. This sensitivity is crucial for detecting buried IED triggers or surveillance bugs hidden in various terrains.