Make sure all taps on your property are off and the meter numbers are not moving (if they are moving you may have a leak).
Record the reading on your meter, from left to right. There are should be a series of black numbers and then red numbers. The black numbers are kilolitres. The red numbers are 100's of litres, 10's of litres and then litres. If your meter has four red dials the fourth dial is a decimal, or tenths of litres.
When you have recorded the reading, carefully measure 20 litres into a bucket from one of your taps.
Re-read your meter and record the reading. The reading on the second red dial should have progress by two units and the third dial should not have changed
