Happy Monday, I am a noob so make sure you listen to the non noobs here but meanwhile just fill out the info sheet and the doctor will have better idea what he/she's working with. I'm on my first auto grow, but that first set leaves looks bizarre like mine are a single leaf those look different. Very cool,
Regarding testing tools really depends on your budget, do you have a local shop you can go to. My local shop sold me on my ph Pen. It's a blue Lab pen, they have a dual kit for testing ph and testing quality of water. Regarding your soil depends on what it is. Pro mix with no nutes I use Roots Organics soil...was little too hot for my seedlings but they powered through and IMO they nutes helped them grow some strong stems and they are reaching the sides of the 3 gallon pots almost its only 15 days (diameter if the pot). Again IMO you can get by on any grow with out all these expensive tools what not but are nice to have. Troll this site, ask tons of questions that's what I do. Good luck with everything.