EVENT-RECORDING DEVICE HAVING AN IDENTIFICATION CODE

A recording device allows wireless interrogation to determine its identity a nd its state. The state indicates whether one or more physical or chemical even ts have taken place. In effect, the one or more physical or chemical events are recorded by the device. The identity of the device allows it to be distinguished from a number of similar devices. The recording device may be used in an array of devices that allows wireless probing by an interrogation unit. When probed, each device tells the interrogator who it is and what sta te it is in. The devices allow multiple use and the interrogator may use a logical reset to determine the state of each device. The interrogator can th us easily identify particular items in an array that have reached a particular condition. The device may record the status of each device in a database to maintain a history for each.