There are plenty of meters on the market, any of which can be used with 'Energy Audit'.
Lets have a look at a few Types
These are the cheapest and easiest to install, just plug n go
Note: These types of meter can often be loaned from most Council Librarys (at least in NSW), and some energy suppliers
Allows you to monitor/test multiple items throughout you home, from a central point.Also easy to install, just plug n go
Good for Long term monitoring of whole circuits (ie Workshop, Granny Flat, etc).Does Require a Licensed Electrician to install.
The Ultimate in ease and versatility, most can be fitted with up to 3 Sensors. Ideal for anyone Serious about Saving Energy