I have a Procaster 55A900H, and there is barely any info about it on internet, like for example i only found a single video review on youtube and i believe that video was in russian. Even the manual and the website where i bought the tv, doesn't tell how bright it can get, so is there an app that could test it and tell me results?
No there is no such app because only way to determine max brightness is to measure it externally. But quick google search gave me the answer, so I dont think you looked that hard..
Measurement results
Brightness
Minimum: 60 cd/m²
Maximum: 292 cd/m²
Only had to use google translate from finish tech page.