| CPC G06F 3/03545 (2013.01) [G06F 3/016 (2013.01); G06F 3/02 (2013.01); G06F 3/03547 (2013.01); G06F 3/038 (2013.01); G06F 3/0485 (2013.01)] | 20 Claims |

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1. A computing device system, comprising:
a computing device including a housing;
an input tool removably mounted to the housing, the input tool having a rod shape and a longitudinal axis; and
a measurement device configured to determine a property of angular displacement of the input tool in response to rotation of the input tool about the longitudinal axis while the input tool is mounted to the housing; wherein:
the measurement device comprises a sensor in the input tool configured to track a position of an object relative to an outer surface of the input tool to determine the property of angular displacement.
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