A sweet, contemporary version of an old instrument, these neat devices were historically used by seafarers to predict the weather.
1.5 x 11.2 x 5cm
clear liquid: bright and clear weather
cloudy liquid: cloudy, possible thunderstorms and rain
small dots in the liquid: humid or foggy weather
large flaky crystals: cloudy skies, snow in winter
threads of crystals at the top: windy weather
crystals at the bottom: frost may be coming