whats the usual ph of RO water?

is it 6? or 7?

The reason i ask is because my gro check ph meter just broke and cant adjust the ph 4, which sucks ballz btw and i need to test the ph really urgently today.

It depends on the quality of the filtration. Not all RO water is created equal. Some comes from low budget RO systems and they filter out the majority of junk, whereas there are high end filtration machines that pass through multiple carbon layers, filtration levels, and other processes that can alter the quality of water. Unfortunately any answers you get will be of a rough idea and cant reflect your water quality to a T as it doesn't take into account the method of RO or the level of filtration it might have gone through. Sorry I cant be of more help.

I go to walmart and on the inspection sticker on the RO machine it says the ppm each time it was tested and its always between like 0 and 3 ppm. The ph is usually right around 6.0

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My RO water is usually 8 but it doesn't matter. I always test and adjust RO water for pH before using. I calibrate a pH meter with distilled water which, unlike RO, is steady and always 7.0.

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thanks for the help guys i finaly filled a 300l tank after about about 40 hrs these things work a bit slow but its alllll good. my ph was at 7....