Singapore Answerers know - where to buy kilowatt hour meter?

Question:I want to buy a meter to measure the amount of electricity consumption of one bedroom.

Is there such a meter where I can just plug into the 3-pin socket in the bedroom to measure the electricity consumed?

Where to buy (in Sg), how much roughly?

Answers:
The local power Co usually has them or has a source, they have one that has a graph built in so you can have a history.
I think they don't hook directly on to the line, I think they use a pickup coil.
you can find a radio amateur club and you might get one of the more advanced members build or help you build one.