The main ingredients of honey are glucose and fructose. For diabetics, who must monitor the level of glucose in their blood, continuous glucose monitors have been developed. It seems plausible that these monitors could be adapted to detect the presence of honey in the parts of the hive designated to store honey. A honey detector would help disambiguate data from the weight sensor, as both bees and honey contribute to the weight of the hive.
A honey monitor in a super could tell the beekeeper when it was full. A honey monitor in the winter stores could warn that the stores had been consumed.
Continuous blood glucose monitor
To our knowledge no honey monitors are yet available.