Learning Resources Boiling Point Thermometers (Set of 10). This set of classroom thermometers is perfect for exploring boiling points of liquids. Thermometers measure temperatures from -30c to 120c, and from -22F to 240F. These boiling point thermometers are mercury free and perfectly safe for primary learners to use. Thermometers measure 2.5cm x 17.78cm. Suitable for ages 8+.