Shake:
Been where you are in my youth and it sucks big time.
I can't help with medium (too heavy to ship in amounts you'll need) but if you have a safe addy I will gladly send you the last of my brand new in box Hanna PH meters. They work ok, but have to be treated gingerly to keep them working (plus no EC measurements)

I have moved on to a MIlwaukee 802 and it is rock solid.

M.P.

PS keep on keep'n on, dude !