Nits test a hoax or true

hi i wanna know about something, i wanna know if these, youtube nits test are just a hoax or something that can be used as an estimate, here they are

Iā€™m not too sure about those.

https://www.uperfectmonitor.com/blogs/portable-monitor/how-to-test-the-brightness-of-an-lcd-display#:~:text=One%20method%20is%20to%20buy,the%20brightness%20of%20the%20LCD.

https://www.google.com/search?q=brightness+testing+app&oq=brightness+testing+app&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIICAEQABgWGB4yDQgCEAAYhgMYgAQYigUyDQgDEAAYhgMYgAQYigUyDQgEEAAYhgMYgAQYigUyDQgFEAAYhgMYgAQYigXSAQkxMTM4NmowajSoAgCwAgA&client=ms-android-samsung-ga-rev1&sourceid=chrome-mobile&ie=UTF-8

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