1. A Radio Frequency Identifier (RFID) reader, comprising: an RF antenna for communicating with at least one tag using RF signals; a range indicator for projecting a visual indicator associated with a coverage area of the RF antenna at a position of a target object when the target object is within a range of the RFID reader; and a controller for calibrating the range indicator based on the position of the target object and the range of the RFID reader when the target object is within the range of the RFID reader.