5-coloured liquid-filled teardrops marked between 18-26C rise or fall depending on the temperature.

A classic science tool that will tell you the temperature and look great whilst doing it. 5 coloured liquid-filled teardrops marked between 18-26⁰C rise or fall depending on the temperature. The lowest floating ball shows the current temperature.

Scientific thermometer
The density of a liquid alters with temperature change
Accurate for a temperature range between 18⁰C and 26⁰C
28cm tall