It does the job to detect magnetic waves in home appliance electric cables. Very useful to check the electromagnetic waves when a lamp is switched off.
It looks ok. The downside îs that the instruxtions are only în chinese. I will look on YouTube for instructions.
It works but îs very sensibile and too bad it does not show the level of magnetic detection as other devices show. But îs practical and easy to transport. Instructions are only în chinese. Not helpful.