This is normal with moisture meters. I use a battery powered one which varies just like these. Trick is to use it as assistance on when to water but pay attention to your plants for signs they are thirsty. Correlate their physical signs of thirst with the level on your current meter and water just before that level next time.
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This is normal with moisture meters. I use a battery powered one which varies just like these. Trick is to use it as assistance on when to water but pay attention to your plants for signs they are thirsty. Correlate their physical signs of thirst with the level on your current meter and water just before that level next time.