What instrument measures the temperature within a meteorological envelope?

The thermistor is a type of temperature sensor that operates based on the principle of electrical resistance changing with temperature. It is constructed from temperature-sensitive materials which allow it to provide accurate measurements of temperature within a meteorological envelope, such as in weather balloons or other environmental monitoring equipment.

Thermistors are particularly valued for their rapid response times and high sensitivity over a limited temperature range, making them ideal for precise temperature readings in various meteorological applications. In contrast, while thermocouples and thermometers can also measure temperature, they are typically not designed specifically for the nuanced monitoring required within a meteorological envelope. A barometer, on the other hand, measures atmospheric pressure, not temperature, further distinguishing the roles of these instruments.