I would like to know if there is a device that is able to measure change of amperage in the wall and so i can automated on-off other devices based on the amperage being supplied by the wall outlets.
thank you very much 
You can use this and flash it with a custom firmware:
https://www.itead.cc/sonoff-pow.html
If you like the DIY scene, you can make this:
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Thank you very much 
I’d second the suggestion of using Sonoff POW.
If you are interested in different options regarding the firmware, I would suggest Snoff Tasmota
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is there any step by step tutorial on how to work on them ?
what i want to do is actually, set… if current > 10 amperes turn off this machine and that.
Sure there is!
Documentation itself is pretty well-polished.
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