noun
self-registering thermometer; recording thermometer
Technical term for a thermometer that automatically records temperature over time, used in meteorology, laboratories, and industrial settings.
気象観測所では自記温度計を使って気温の変化を記録している。
At the weather station, they use a self-registering thermometer to record temperature changes.
Compound of 自記 (self-recording) + 温度計 (thermometer).