How to design a bath gauge

Points to consider:

First work out the type of material you are going to use.
Remember that the gauge will need to be waterproof.
Design the gauge. Make it colourful, easy to see and use.
Work out how you are going to put the scale onto the gauge [markings….20 litres, 30 litres etc].
Remember how you worked out how much water you use to fill a bath. [click here if you need reminding] This time you will need to fill the bath with a known volume of water. Mark it on your gauge and keep filling the bath and marking on the gauge till the bath is full.
Work out how you will attach the gauge to the inside of the bath. [clue….suckers]

GOOD LUCK!