In this article, we will try to introduce the equipment used and useful in the greenhouse in 12 parts and review the important points in their preparation and use. In this section, we will introduce Demangar.

It is a device that records ambient temperature changes on a specific screen. This device is composed of a temperature-sensitive plate attached to a lever, the end of this lever is attached to a stability pencil, on the other side there is a cylindrical device that starts to rotate slowly after tuning, which makes a full turn on the cylinder of a checkered paper plate that can be replaced every day.

The stability pencil is placed on the screen and draws curved lines by moving the cylinder. After one day, you can refer to the device and obtain ambient temperature fluctuations from the curves drawn in the previous day.