A device for evaluating at least one analyte in a test sample. The device comprises a cassette having a hollow test chamber, a test strip disposed within the test chamber for receiving the test sample, and a temperature control member. The cassette has at least one aperture extending from an exterior of the cassette to the hollow test chamber. The test strip includes a reagent adapted to react with the at least one analyte to produce a reaction indicative of the presence of the analyte. The temperature control member is adapted to extend through the at least one aperture in the cassette and into the test chamber for controlling the temperature of the test chamber.