Is it deep enough? I haven't measured how deep they bury their eggs. There is currently an egg in the ground there, but I don't want to dig it up as I won't be able to put it back correctly nor have I had any success with artificial incubation. I tried burying it as close to what I remember previous depths were when I observed them laying.
My thinking is to be sure the same amount of soil depth is on top of the container as would be on top of the egg. Pack it down firmly as tortoises take hours packing the soil above an egg chamber. Be sure it is the same type of native soil that a tortoise is using as soil type makes a difference as well. Not sure if humidity will be totally accurate as a tortoise releases quite a bit of water in a nest as she digs. All of the species I work with also make a nice mud plug to seal the top of the egg chamber to also protect and would keep in humidity. But with a single egg, perhaps Dan has better insight on how a Chersina lays and constructs the nest.
Do you have another sensor that we can get a concurrent graph of ambient outdoor air and humidity? That would be awesome. I build graphs like the one earlier in this post with the data from the two sensors aligned by time for comparison. Perhaps you could email a download file every few weeks or so?
Thank you so much for doing this!!!!!!