Thermostat and TDS meter
Thermostat is a device that automatically regulates temperature, or that activates a device when the temperature reaches a certain point.
Mechanical thermostats use of thermal expansion to switch an electric circuit on and and off. The two most common types use bimetallic strips and gas-filled bellows.
A tds Meter indicates the Total Dissolved Solids (TDS) of a solution, i.e. the concentration of dissolved solid particles.
When voltage is applied between electrodes, the ions become charged and moving, thus constituting an electrical current. TDS meters monitor the amount of current that passes between the electrodes as a measure of the number of ions in a solution.
We are thus using thermostat and TDS meter to measure and control temperature and salinity to get a better yield.