Ultrasonic cement analyzers provide a continuous non-destructive method of determining compressive strength as a function of time by measuring the change in velocity of an acoustic signal. These units analyze the waveform and the frequencies at which the acoustic signal operates. The cement slurry to be tested is placed in an autoclave unit with temperature and pressure adjusted to simulate downhole conditions. An acoustic signal is then transmitted through the cement sample. As the strength of the cement increases over time, the faster the acoustic signal travels through the sample.