My meter needs the 7.0 and the 4.0 .... I use the 7.0 for storage... So I go through more of that... Somewhere I read filtered bottled water is good storage too... In fact... Brewing right now... pH is at 5.4... I'm good!! Sneezles61
I hope things are going well!!. I am planning on using the storage solution. Directions said to soak the meter in some bottle water first for 30 mins than the calibrate.