Is there a way to use the subsoil reading vs the topsoil reading from the sensor. For example the top soil reading always reads 100% but the sub soil says 55% which is more believable in Florida's Sandy soil. The unit did not water for 27 days and still read 99% and sub soil at 20%. I watered it to see if it would change. When I take the sensor out of the ground it does change state.