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Review title: poorly designed
Product review: I was aware of the need to always have it immersed while on, but it still died. The clip that keeps it on the rim of the cup/glass/beaker/etc. isn't strong enough and the cable's weight made it tilt to the side such that only 60-70% of the coil was immersed. Apparently that was enough to kill it. Also it isn't fully immersible which means that it only heats the top surface of the liquid--frequent stirring is required otherwise because convection currents cannot be established. I'd stay away from this.
