Flow meter wouldn't be worth it, as for taking it apart, i would want to refill it anyway. Also tubes with this AIO are pretty bad and giving me weird bends already, so might as well replace them. This 240mm rad is used in front pulling air in, only space i have for 120mm one is at back, to push air out. Tubes wouldn't bend that much this way, although it wouldn't look very aesthetic. Just depends on cooling performance if its worth it or not.