Stored grain pests are indirectly responsible for food scarcity due to deterioration and quantitative loss caused by them to the stored grains. Before taking up any management strategy, detection of the level of infestation is crucial for effective management and avoiding the extra cost of plant protection activities. Thus insect monitoring is the basic step in any crop protection activities. The majority of the stored grain pests are concealed feeders and the damage symptoms are obscure. Traditional monitoring systems like visual inspection, light and pheromone traps are labor-intensive and time-consuming. Advances in science and technology led to the development of sensors to detect hidden infestation in grains and forewarn the godown keepers and farmers to take timely measures to avoid heavy losses. Sensors have a wide range of applications in stored grain pest management to bring down food grain loss due to qualitative and quantitative deterioration.