The bimetallic thermometer pointer for long what's the purpose?

As we all know, the working principle of bimetallic thermometer is a thermal device is composed of two layers of linear expansion coefficient difference is relatively large pieces of metal welded together, one end of the element as the fixed end, on the other side of the free end. When the temperature changes, because the bimetallic strip of material is different, linear expansion coefficient of relatively large differences, and produce different expansion and contraction, leading to the curving deformation of bimetallic strip, equipped with actuator (at the free end Dial pointer and temperature) So that it can directly show the temperature value. That the bimetallic thermometer pointer do long what's the purpose? We use the following this thermometer to explain this problem. Model: A300C - 1 ( WSS3B825150) Type: hot shell bimetallic thermometer structure: universal type cover circle: flange type, tray type panel material: stainless steel SS304 tooth head: 1/2 & quot; NPT other optional surface diameter: 80 mm heat pipe diameter: 6. 35 mm heat pipe length: 150 mm ( 50 - Optional) around 1200 mm. Temperature range: 0 - 150 c F ( Can be customized) Accuracy: & plusmn; 1. Table: 5% glass protection grade: IP65 ( Dust, water) According to the working principle and structure, bimetallic thermometer pointer is mainly used to indicate a reading. If the bimetallic thermometer pointer extended, magnify tiny variation to the bimetallic strip shows that it is easier to see, is more accurate.