Hi Everyone, I wonder if anyone can help me. I have 3 EC meters : https://www.amazon.com/UBANTE-Profe...1859318&sr=8-28-spons&keywords=EC+meter&psc=1 & https://www.amazon.com/Bluelab-Trun...=1491859307&sr=8-1&keywords=bluelab+truncheon & https://www.amazon.com/Oakton-Water...UTF8&qid=1491859318&sr=8-23&keywords=EC+meter The UBANTE measures in Us. The Oakton measures in mS. The BlueLab measures in EC, CF, PPMx700, PPMx500. I am trying to understand if perhaps my truncheon meter is not working correctly. I will explain why: I have conductivity testing liquid: 1x @ 2.77EC 1x @ 1.4 EC If I use the UBANTE in the 2.77EC solution I get 2900uS If I use the Oakton in the 2.77EC solution I get 2.8mS If I use the truncheon I get I get HALF the reading of the EC solutions!?!?!?!?!? So in the 2.77EC I get 1.4EC reading. on the 1.4EC I get 0.8 reading. I suspect my truncheon is broken, however I have been using it to feed my plants. Currently my Truncheon meter is readin an EC of 1.4 for my girls in VEG. They look fine, ZERO BURN. If the REAL EC was DOUBLE, then that would mean that the EC was 2.8 in coco, I would have burn on my plants and wilting...my plants look great....definitly does not seem to be getting an EC of 2.8. If I use the other meters the readings I get are 5.3mS and 5,000 uS. Are my other meters reading too high?? (although they are reading the conductivity standards fine). Is my truncheon brocken???? I have tried cleaning it with the same results..??? I have always fed my plants with an EC of 1.2-1.4, but these other meters are confusing me??? Thanks for any help or suggestions!!!