It is telling you PPM's. EC is expressed in 0.1 measures and must be converted on dif scales. Some meters will tell you both and give conversions for dif apps.That's 1350 and it is way high for seedling. For small seedling it should be around 300 or 400. Like 1/4 strength. You can just remove some water and add fresh to bring it down.

What kind of water are you using ? Hope it is not the tap water at 701
LOC NAR on probation Reviewed by LOC NAR on probation on . EC-3 reading confusion! Hi, I just took a reading on one of these EC-3: Handheld Conductivity Tester with Case - HM Digital (EC-3 meter) and the reading was 146 - and when I did a reading on my tap water it was 701 ... just wondering if I'm doing this wrong, as it is really confusing for me. The 146 reading is in my aero setup and they are 2 week old seedlings (which look like they arn't doing to well - the 1st true leaves curling under - any help would be really great. Thank you for your help! :) Rating: 5