Is there a line between unconscious and conscious beings?
The consciousness meter is a splendid example of begging the question. Scientists cannot build a consciousness meter until they reach agreement on what physical conditions are necessary and sufficient to produce consciousness. But scientists cannot reach agreement on those conditions unless they have a consciousness meter, a means of solving the solipsism problem.
As long as we can’t solve the solipsism problem, we will favor theories of consciousness for subjective reasons. You are big-hearted, so you grant consciousness to spiders, jellyfish, sexbots, dark energy and thermostats. (According to integrated information theory, it might feel like something to be a nuclear warhead!) I am a snooty tight-ass, so I restrict consciousness to humans, primates and a few especially clever birds, like crows. Your Consciousness Club is capacious, mine vanishingly small.