Stop what you are doing, start reading... a lot.
Stop wasting money.
Anyone who wants to drop the dime on Bluelab equipment but doesnt know what storage solution is, should not be growing anything yet.
If you wanna do it, take it seriously. If you just wanna burn cash, theres more fun ways....
I know I sound like a dick, but... this storage solution comes in sample packets with the pen and monitors. Its sold alongside the Ph calibration solutions... (And yes, you need at least the 4 and 7, and having all 3 dont hurt)
If you wanna do it cheap, just get drops or a cheap ass Ph pen.... Bluelab is not cheap, and breaking it because you didnt read the paperwork that came in the box....... why bother at all?
Do it right, or hire someone to do it right for you. Dont spend a couple grand and 12-18 months for a couple ounces of fluffy buds....