Operating range of plus 100 to plus 240 degrees f, adjustable 5 to 30 degrees f, surface mounting, remote sensing bulb of copper with capillary length of 60 inches, bulb size 2.875 in. Long and 0.375 in. Dia, immersion depth of 3.375 inch, case is smooth grey enamel finish, dim are 5.861 in. High, 2.125 in. Deep