I'm probably just taking the reading wrong. I just water my plants and then take some water out of the saucer they flow into. This is my first time monitoring runoff I'm putting in 800 PPM nutrient solution into the soil, and it's late veg so I don't think the soil is throwing it off, and my readings coming out are like 2,000-3,000 which I'm assuming if it were true would just straight up kill the plant.
Nothing Special, I used my meter and my buddy used his and they both read over 2k, mine is just Amazon's finest that's below, I can't speak for his but I know it was around the same thing, just not backlit display.