A label holder for use in a moist environment including a body panel connected at its lower edge by a resilient hinge to a transparent cover member to form an openable pocket for labels therebetween. The body fluid analyzer includes a disposable strip for receiving a sample of body fluid on a target region, the target region including gold sol-gel to provide surface enhanced Raman scattering. In one embodiment, the separation of the coordinates of each normal vector of the frustum planes enables implicit selection of the coordinates of a negative vertex of an axis-aligned bounded box. A buffer insulating layer region is disposed on the first insulating layer opposite the first electrode and a phase-changeable material region is disposed on the buffer insulating layer region. When the brush is removed, the matrix springs back and removes any hair, fur, or other material entangled in the hair.