A reaction vessel having a reaction chamber for holding a sample is fabricated by producing a housing having a rigid frame defining the minor walls of the chamber. A wireless transmitter is also provided for outputting the sensed data from the meter or receiving instruction information through an antenna. Accordingly, an erasing efficiency of the cell transistor can be enhanced. The interpositional member may be a split ring with a conical exterior surface that mates with a conical surface of the implant. The machine also recommends an item to a potential buyer.