These keyboard readers & probes are enabled to read the unique 64-digit serial number. Using a simple writing software, an iButton®, and the Keyboard Reader, users can obtain the unique ID in seconds. The probes can also mission and write iButtons with information to collect data and extract data after use.
For a walk-through on how to use the iButtonKeyboard, please visit: How-To: iButtonKeyboard.
A guide from Maxim Integrated on how to mission Thermochron/Hygrochron iButtons: Mission Thermochrons/Hygrochrons.