Moisture Meter YES or NO? (Could harm the roots?)

Nope, it won't hurt your plant. And who knows, it might be useful to you. Different strokes for different folks and all that jazz. I say test it out and see if you like it. Good luck!

LOL! I bought one of those with TWO prongs and I felt the same way you do! But they really DON'T hurt the roots so don't worry about it. I never measured moisture with it although I could... I found (and still find) that picking up the pot is a good indicator of whether or not a plant needs something... pick it up after you've given it enough water so that you've had some runoff - you'll feel how heavy it can be... then pick it up when the top looks dry/crumbly and you'll see how lightweight it is... it gets to the point where you can actually identify areas of the pot that are wetter than other parts! One side might feel heavier than the other... Anyway, when the pot feels super light, you need to water/feed... if you can still feel good weight in it, leave it alone. Good luck!

Autrement pour l appareil en lui même c est mieux de le planter prendre la mesure puis le sortir bien nettoyer (anode et cathode) et quand tu a de nvo besoin tu le plante de nvo

Pas fan de ce style de merde (oups pardon) Sérieux arrose la terre jusqu'à se que l eau coule légèrement vers le bas (des sac de culture dans l ideal sa évite la pourriture des racines et cela pour moins cher que se truc en photo ..et une fois arroser tu attend que les 2cm du dessus de la terre soit sec avant d arroser à nvo c est pas plus compliqué ^^