they look fine. do you have a pic of the meter ? is is just the single prob ?

when using the meter, if the soil is dry a few inches off the bottom then water. also at this time pick your pots up and feel there weight (dry), you will start to get a feel for when they need water.

i like to let my soil almost dry out before watering. this helps with building a better root mass as the roots go in search for the water.

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