C.T.D. unit Posted on March 25, 2012 | 3648 × 2736 | Posted in Return to Jennifer Fry: March 24, 2012, Oscar Elton Sette ← Previous Next → The C.D.T. unit is safely back on the deck. Scientists collect an array of data including density, temperature, and conductivity using the C.D.T. unit. Post a comment or leave a trackback: Trackback URL.