Abstract: A dynamic barcode system includes a microprocessor connected to a sensor or group of sensors. The microprocessor connects to a barcode display. Data collected by the sensor or group of sensors is processed by the microprocessor and sent to the barcode display. A barcode reader reads the barcode display. The barcode display, microprocessor and group of sensors are arranged on a packet which is attachable to a specimen to be monitored. The barcode reader has an infrared transmitter for sending a signal to an infrared receiver associated with the barcode display. The infrared receiver upon receiving a signal from the barcode reader sends a signal to the microprocessor requesting that the microprocessor send requested data for viewing on the barcode display. The displayed barcode is then read by the barcode reader. In such a manner, continually changing data collected by the sensors can be stored and retrieved as desired.