bar thermometer
A type of thermometer consisting of a glass tube with a liquid that expands and rises along a scale. Used in laboratory and industrial settings.
I measured the water temperature using a bar thermometer in the laboratory.
Compound of 棒 (ぼう, 'bar, rod') + 温度計 (おんどけい, 'thermometer'). The name describes the rod-like shape of the thermometer.