Abstract: An apparatus and method for appendage worn biometric sensing devices. A moveable sensor carrier is captively retained in a housing containing the biometric device. A biasing component urges the moveable sensor carrier in contact with a skin surface of a monitored subject to maintain a regulated pressure of the movable carrier against the skin surface. A biometric sensor carried in the movable carrier enjoys an improved signal quality regardless of the exact positioning of the biometric sensor by the user.