It is very important to maintain the atmospheric conditions (Temperature, Humidity etc.) in a Spinning Mill. These factors directly effect on the process and on the quality of the product. These atmospheric conditions are different for different materials and vary in each spinning department.

In order to measure these quantities uses a meter which known as "HYGROMETER". This device contains two different graduated bars, out of them first calls as DRY BULB and second one as WET BULB. These bars show the dry & wet temperatures at the point Hygrometer is fitted. By knowing these values we can calculate the Humidity % at that point in the department.