APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

Ocean Forest runs pretty hot (high ph). It kinda screws a lot of new growers, idk why it's so touted. Dont feed them at all for the first couple weeks with that stuff. Root issues also maybe Also every grow will have some issues kind of inevitable with living creatures You also need a ph probe. https://www.amazon.com/Apera-Instruments-AI209-Waterproof-Accuracy/dp/B01ENFOHN8TDS/EC pen when you're more experienced

This is the one I use: https://www.amazon.com/dp/B01ENFOHN8?th=1 and the EC meter: https://www.amazon.com/dp/B06XKMH86J?ref=ppx_yo2ov_dt_b_fed_asin_title