How to spot a fake UVC wand Scam

Let's talk about UVC lights that are used to kill bacteria and inactivate viruses.
Unfortunately there’s a lot of FAKE and substandard products being sold!
There are literally thousands of people buying “UVC wands” that are actually just colored LEDs or UVA LEDs, meaning it's not really sanitizing anything.
There are also people buying genuine UVC wands, which include low-pressure mercury lamps. The problem is, they all look the same, but the amount of UVC they generate varies hugely.
For example, I compared a wand from UV Care which generated 1950 μW/cm² at 2 inches