Sickly plant

didn't u think that u were good until u listened to guys from the forum xDDD throw away that piece of shit of device from pic 1 looks like these plants are underwaterted and overfed so u need to flush em and feed anew with 400-600 ppm right away then u don't let em dry out and fead/water etc schedule

Over watered & over fert.

Soil meters that work cost hundreds.. I wouldn't go off that temu Guage it can't be giving a correct value..

7 is not too far off ideal. I see a deficiency that could be from the water you are using. If it is tapwater, get the detailed water report from the city. Look at the calcium and magnesium content in it. If you see something like 100 mg/gallon calcium and 10 mg/gallon magnesium then its not good at a 10:1 ratio. You need more like 4:1. In that case add magnesium only. Post again with the specs from the water, and you will get better answers.

Think that's light-related... top couple nodes are super tight based on leaves and chlorosis near the top - along with the droop. It may have been able to stand up to it initially, but that sort of droop doesn't always happen over night.. sometimes it takes 1-2 weeks. 7.0 may not be optimal, but it won't cause problems. Soil meters are not very accurate for various reasons. You may find a really good use for it, but better to learn what is normal for a healthy grow then worry about deviating from that once you have the familiarity. It may not be accurate, but it certainly correlates well relative to context. How you interpret it immediately after an irrigation vs some portion through the dryback (should be mostly the plant drinking, and a minimal portion from evaporation). Medium looks very dry up top. If this is soil, you only have to wait for 1" deep to get dry, then fully saturate. Never partially water. Wait for the 1" dryback and repeat. If this is soilless, also religiously get 10% runoff. If it's coco, don't have to wait for the surface to dry, but should be close.. and these things all have plenty of cushion. Above all, if the plant wilts from lack of watter, make a mental note of how light the pot was... always avoid that in future.

First step IMO would be... Dont use "soil meters".

Could be over or underwatering. You’ll know which one it is based on your watering habits. As for the pH, make sure that you’re watering with corrected pH in your water/nutrient solution and she’ll be fine.