Liquid thermometer has five floats with temperature gradients of 4F from 64F to 80F accurate within 2.5 degrees.
Galileo liquid thermometers are fascinating, functional instrument is the point at which science meets art.
Four hundred years ago Galileo discovered that specifically weighted floating bubbles would predictably rise or sink in a liquid as the temperature of that liquid is changed.
These decorative glass reproductions of Galileo's discovery have glass floats precisely weighted in .006 gram increments suspended in a clear,environmentally safe,non-toxic liquid (an inert oil/hydrocarbon mixture like mineral oil)
The cylinder walls are laboratory grade glass for sturdiness.
Simply read the gold-plated tag on the lowest floating bubble to read the temperature.