This is a simple temperature measuring meter. In this we have used a Thermistor, resistor of 1 K ohm and a milliammeter. When the temperature increases then Thermistor resistance decreases. Due to this current through the circuit increases. Hence here the current through the circuit is directly proportional to the amount of the temperature. As the temperature increases the current starts increasing. To get accurate reading of the temperature we have to calibrate the milliammeter for different conditions of temperature. This meter can also be used for heat measurement.
Circuit Diagram