but but but... Rockets are so Kewl! Actually, 5% is probably within the realm of the other tolerances for this kind of testing. I would imagine consistency is more important.. either use the TFT vials or the Taylor ones, not both.Or you can hit up your local drug store for a 10ml syringe for kids medicine. It usually has marks every 1ml so you can accurately mark 25ml easily.
Pool chemistry doesn't need to be rocket science, being consistent in your testing practice is more important than a 1ml error on a testing tube.
... Will keep the little kit out by the pool for daily testing and the TF in the house
Good to know thanksLeaving any reagents outside will affect the integrity of the reagents due to temperature and sun exposure. While you can take the kit outside to do the tests if you like, it is recommended to store the kit indoors in a temperature controlled environment - so in the heated/air conditioned part of the house... not in the garage either.
I use the K-1000 pool side (stored indoors), I do the CYA test outdoors and all other tests indoors.