An inventory shelf monitoring system includes a plurality of track systems located on at least one shelf of a retail or warehouse establishment. Each track system includes a sensor and actuator that determines the position of a product pusher. The identity and location of the product pusher, for each track system on the shelf, is sent to a data acquisition and transmitter circuit that assembles, formats, and transmits pusher position data to a central receiver. The data is then transmitted to a central processing unit in a user device that maintains data corresponding to product count, availability, and activity associated with each track unit of each shelf employing the system. Inventory control, the prevention of out-of-stock situations, and the assessment of activity indicative of theft or accident is thus monitored in real time for prompt remedial action.