Show me the thermometer-equivalent that measures ownership. Ownership is a fabrication of human mind. If it was part of the universe we would be able to devise

Show me the thermometer-equivalent that measures ownership. Ownership is a fabrication of human mind. If it was part of the universe we would be able to devise an instrument that mesures it. We've done a very good job of reifiying it and telling people that it's part of the natural order, but humans are very very good at constructing ontologies and forgetting they are the authors.