Patent ID: 7171259

Claim:
A heart rate measuring device to be attached around a user's wrist, the device comprising: an attachment device fixed to a measuring unit; an inner surface arranged to be in contact with skin of the wrist to which the device is attached; an outer surface other than the inner surface; an electrically conductive inner structure provided on the inner surface of the measuring device and comprising at least one electrode adapted to be in contact with the skin of the wrist to which the device is attached; an electrically conductive outer structure comprising at least one electrode adapted to be in contact with the user's other hand and electrically isolated from the electrically conductive inner structure; a measuring unit to which the electrically conductive outer structure and inner structure are connected for heart rate measurement, wherein the electrically conductive outer structure of the measuring device extends at least to opposite sides of the wrist to which the device is attached, the electrically conductive outer structure comprises at least a first electrode and a second electrode on the outer surface of the measuring device, on opposite sides of the wrist to which the measuring device is attached, which first electrode and second electrode the user is to touch with separate fingers of the user's other hand from opposite directions of the wrist to which the device is attached, wherein the electrically conductive outer structure comprises at least two electrodes, which are on different sides of the wrist to which the device is attached, and at least one of the electrodes being connected to the measuring unit with a wire inside the wristband.