Foxx water sensor


iv had a foxx water sensor fitted for a couple month now and it saved my butt today by working great and detected a leak, got that fixed but the sensor was stuck in the wet status, couldn’t clear it after even removing the battery’s ect so i deleted the unit from my smart things app and then set smartthings to find it again, it manages to find the sensor but when i test the prongs it always stays dry ?

i can not remember if im meant to use a new device handle, any help would be great thanks