This paper contributes to the Symposium: "Research Methods Involving Children's Drawings in Mathematical Contexts" by exploring the use of digital pens as a data gathering tool. The availability of digital recording devices has been a boon to researchers wanting to capture the real-time dynamics of a research situation. When capturing a child's drawing process, an alternative to cumbersome video-recording equipment is a digital pen that records both the creation of the drawing and any nearby utterances. To highlight the affordances and limitations of the digital pen as a data collection tool for children's drawing we utilise examples from two different research projects, one with Australian children and the other with Canadian children. [This paper is the second in a symposium of four papers. For the first paper, "Using the Drawing-Telling Approach to Reveal Young Children's Mathematical Knowledge," see ED604537. For the third paper, "The Nature of Young Children's Attitudes towards Mathematics," see ED604539. For the fourth paper, "Coding Young Learners' Pictorial Responses to an Open-Ended Assessment Task," see ED604540.]