“ph Controller”=1 ph probe （5m and plastic）+ 1 controller orp Controller=1 orp probe （5m and plastic）+ 1 controller 4 fluorine electrode=1 ph probe（5m and 4 fluorine）+1 controller Glass electrode=1 ph probe（5m and 4 glass）+1 controller ph probe=1 ph probe with 5m plastic orp probe=1 orp probe with 5m plastic only Controller=1 controller