RFID works over very short distances.
It won't tell you, who is present in a classroom. It might tell you, who has walked through a doorway. Although it won't tell you very reliably whether they were walking IN the door, or OUT of the door.
RFID works over very short distances.
It won't tell you, who is present in a classroom. It might tell you, who has walked through a doorway. Although it won't tell you very reliably whether they were walking IN the door, or OUT of the door.