Although seemingly used in many Chinese factories, this unit is not compliant with electrical standards in "safer" countries.

It's described as an explosion proof tester - but that doesn't mean it can be used in high risk explosive environments. It just means it has a series load option that prevents faulty devices exploding, by limiting the current through them.

As with all these Chinese factory test boxes, they take a rather slack attitude to electrical safety, and the lack of polarity, exposed bulb threads and misuse of speaker connectors for 220V (China's supply voltage) means that the unit poses a shock risk to the unwary.

Still better than the two nails in a bench I've seen being used to test bulbs in some factory videos.

I suppose that one of the screw-in ceramic vivarium heaters could be used as a safety load too if the tungsten bulb it's designed for is hard to get.

These units are sold on AliExpress as LED bulb testers. But I really can't recommend them for safety reasons.


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