Distilled vinegar has to be PH 2.5 by law in the UK due to stupid EU laws so it is extremely reliable, so in future check your facts.Vinegar isn't anymore trustworthy than tomato juice (usually 2.4-2.6), and its pH is further from our range..
The best place to ask would probably be sciencemadness.org, but don't talk about anything drug related there!
a precision of 0.1 is not necesarry in growing cannabis. All I was saying is Uk Distilled Vinegar is good to use and costs the equivalent of $0.25 for a litre, whereas buffer 7 costs $15 for 200ml.Ok dude, well I don't live in the UK.. I do supervise titration labs etc each and every semester and see first hand results that tell me I'm not wrong..
Regardless ppl buy pH solutions for a reason.. Most meters are more precise than 0.1..