Yes, I have seen those but I really don't know anyone that uses one. What I do when I'm in doubt is 'read' my skewer. It's a wooden stick, like a chop stick that I put in the middle of the pot. I leave it their and when in doubt I pull it out and feel (with the skin between my lip and nose because that is very sensitive) how moist/cold the stick is. This is a very good indication to know if you should water of not. It depends on the species/hybrid when to water.
What plants don't you feel sure about? Maybe we can guide you?
Nicole
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