Here's a few links to some PAT resources so you can read up on the topic and make an informed choice.
Wikipedia article on appliance testing.
HSE website with a wealth of publications on electrical saftey & testing.
If you are after low price labels for your testing trying sourcing your own and pass the savings on to your customer we use:
We use Seward test equipment as we believe it to be the best on the market, find out more at