I dont tolerate led or lcd tvs or monitors. Only a tiny bit, of course depending on size, lightstrength and distance. Even Smartphones and tablets. What detector do I need to measure the bad radiation that these Things emits?
You could try a dirty electricity meter. Some TVs make more dirty electricity than others.
But this only tells you how much EMF is going in the wiring, not coming out of the TV.
Generally not a lot that you can measure. E fields can be high unless a coax cable is hooked up which will ground the TV. Most TVs have 2 prong, no ground. So the coax can ground it, if it's a grounded coax cable which they all should be if installed properly.
M fields are pretty low also, and RF fields will be in the range that can't be easily measured. An AM/Shortwave radio works best, and will buzz loudly when closer to the TV.
There is also the ESmog Spion meter that can measure light emissions. I don't think it's the light coming out that causes problems, unless it's flickering then maybe it can cause headaches, but not skin burning. For me face burning is EMF related, not light.
There are USB laptop screens that are supposed to be better, but I haven't tried any. It plugs in the USB only, not in the power outlet. If you use that with a laptop on batteries it should be better, but you also have to ground the laptop. There are USB ground cables that you can use to ground any laptop.
I find laptops that cause minimal heat and don't have a fan running most of the time are best. More heat and fan running will emit more EMF.
i don't have a spion, can't say,
you probably won't find much use in it if you only want to find safer equipment.
meters will only tell you all modern devices are bad or worse.
You're body/feeling is probably the best meter.