EC Pen Juice Learnt something. Needs a bit more time to verify the effect. It would seem that replacing the battery of the EC Pen has given me a more reliable EC measure. Readings are instant and the mode has remained the same through out the measure. In order to coax the lettuce into a healthy and prosperous size for the coming Niu Year, I have extended the lights off time from 10 to 1030pm. DATA EC1374 pH5.53 WT30 Water level: at mid level.