That is very odd, but I imagine if your not a good at keeping your plants alive it could be worth it.
My wife works as an interior gardener. They don't bother using those electronic soil wetness testers. She was told that they don't work all that great. So, they use a tool that is really just a bar with some notches cut in it. You shove it in the soil and when you pull it back up, there is soil in the notches from the various depths. Its pretty quick and easy to see how wet the entire pot is.
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