Biobizz ppm testing

Just bought a com-100 TDS meter to measure ppm but now not even sure if you can measure organic nutrients. I was told to measure my ppm as my autoflower had some issues and it could be down to over feeding. If I can’t measure the ppm of the feed is this meter useless to me? I’m growing in Bat special mixed with biobizz light mix and using biobizz nutrients only.

You can probably do a slurry test , basically turn the soil to mud in a container and check it.

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