Test Tube Agglutination viewer for use in blood banks to grade agglutination test. The Becton Dickison test tube viewer is the standard type of viewing apparatus used for all agglutination test in blood banks such as forward and reverse typing and antigen typing. Becton Dickison (BD) offers this viewer under the Clay Adams product line. The agglutination viewer is equipped with a xenon lamp bulb and concave mirror for detailed viewing of both the top and bottom of the test tube. The mirror is held to the lamp assembly using a magnet. The magnet enables the mirror to be easily adjusted to the technologist viewing preference.