A simple instrument for the remote sensing, magnetic recording, and linear display of temperature is described, which is well suited for synchronous recording of temperature and dependent phenomena. A range of 40°C is displayed both during recording and playback, accuracy and resolution being a fraction of a degree. No recalibration or adjustments are needed. Small power consumption (30 mW from a single battery) suggests field uses, possibly unattended. Construction is easy and standard components are used throughout.