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Hydroponics Grow Tents Indoor Bud Dark Room Mylar Grow Box 120 x 120 x 200 cm

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Converting PPM to EC ?

Hey guys I just got my TDS (total disolved solids) meter and gives me readings in PPM, and I'm looking to convert it into EC (electrical conductivity). But when I google the conversions I get 3 different ppm conversions: Hanna, Eutech, and Truncheon.

I dont know which one my device is.

I put pic of the chart and of my meter if it helps.

Thanks


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