For some context, I recently got a hanna low range phosphate checker and I have a few questions for people with expirance with these testers. Firstly, how do you get all the tritant out of the packet? Also the instruction manual says to keep the vial clear of fingerprints for a more accurate result, so, how do I handle it? And overall what's the best way to ensure you get 10 mm without having to buy a graduated pipette? The best wait time before testing and mixing, does lighting matter? Thank you for the help.