There are 3 types of electricity meter:
Digital Electricity Meter
Modern electricity meters have a digital display, a bit like a calculator or digital watch. It should display 4 or 6 numbers. You need to note this number down.
Mechanical Electricity Meter
These meters display several numbers on a black background, and there may be some numbers on a red background too. You only need to note down the black numbers.
Dial Electricity Meter
These meters look a bit like a clock, with numbers from 0 to 9 showing how much electricity you've used. Starting with the left dial, note down which number each dial is pointing to. If it's between two numbers, write down the lowest number. If it's between a 9 and 0, write down 0. Ignore any red dials.