This powerpoint tester is designed for use with Type B sockets in Canada, Japan, Philippines, Taiwan, Thailand, USA, and other countries with Type B powerpoints.
In some of these countries, the powerpoint may not be earthed by default.
We recommend that you test the powerpoint before using your earthing products.
Plug the tester in and watch for the pattern in the lights (the centre and right lights come on when wired correctly).
You can also purchase this Socket tester plus an earthing adapter as a set.