Watering indicator


Hi all, Ive recently inherited a lot of houseplants and am afraid of killing them, I want some watering indicators and remember these little plastic tabs that would change colour, all the modern ones seem to be exspensive but these were cheap in the 90's and as I recall were used alot by my mother. I'm sure they still exist but I cannot find them on google no matter what I search, I'm sure I just don't know the right name for them. Does anyone know what they are called?

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