@metalcrow I’ve also been shopping for the ph meter… I think i finally have a found a one touch easy calibration (yellow as well) as hammer mentioned.
For the tds i have one of those “Zero Water” pitchers which came with a blue one. I also grow Venus Fly Traps (named Audrey II if you get the reference) it needs water without any minerals or tasty additives etc (will kill her). Distilled or R. O water is suggested but I found both Zero Water and distilled both test around the same TDS.
So i now water all my plants with zero water… 2 of 4 of my MJ seedlings have died but im fairly confident this was a lighting issue… My VFTs are doing well and this option is cheaper than buying water.
I’ve read that distilled water should have a pH of 7, a good starting point for testing and adjusting the pH…time will tell if this works and if so a cheaper / easier option than buying water at the store.