The main advantage of this adjustable thermometers lies in its readability and adjustment . The length of the case is 7". The PLASTIC FRONT PANEL , prismatic tube and white V-shaped metal scale board highly improve the visibility and beauty of it . The stem can be rotated 360 °, so customers can install it to their desirable position. Specifications 1) Upper part Material of casing: 7" ,Die Aluminum 2) Glass insert Material : prismatic glass tube Fillings: Red, blue, green organic liquid Temperature Range: -40～160 ºC 3) Stem Length of stem: 2"，2-1/2" , 3", 4", Material: Aluminum, brass, or Stainless Steel Thread of the stem: 1/2" ，M20＊1 ， M22＊1.5 Material of thermowell: Brass