dont mean to be picking on you dgsgandalf but if your are needing to water ever 4-5 hours somethings wrong, thats the perfect condition for root rot.

also, i dont see how going out and buying a meter guage is much more convenient and less damaging than sticking your finger in the dirt ( or you could lift the pot and see how heavy it is)

again, dont mean to be picking on you just trying to give some constructive critisism. take care