The tool opens to show a thermometer which measures 0 to 100 Celsius. Alter the temperature shown by dragging the slider bar to the right of the thermometer. Clicking the ‘?’ button underneath the slider reveals the current temperature ( click again to hide this information). Underneath the bulb of the thermometer is a control to alter the scale on the thermometer - click and then select another scale from the menu.

Click the ‘Add thermometer’ buttons to the left and right of the screen to add up to 2 more thermometers. click the black ‘X’ on any thermometer to hide it.

‘Set up’ opens a menu in which you can opt to display only the start and end values on the thermometer scale, or have a fully-numbered scale.

Clicking Reset undoes all changes you have made, returning the tool to its default state.