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Hello guys, How do you calibrate TDS/EC with this one? It only came with a PH buffer, no TDS/EC buffers. Do I need to buy it?

Hello everyone, I’ve been growing outdoors but want to try indoors. Looking for LEDs for my 5x5 grow room. I'm in Europe so looked into Mars Hydro FC6500-evo and Spider Farmer SE7000. But reading that both have some bad reputations made me think twice. Do you have any experience with them...