The high price I have known so. However, there are alternatives. But from time it sucks to pay attention to the water level. Good funktianierte a strong speaker magnet. Adhered to the right place from the outside without interfering with the machine. My old swimmer magnet had "degraded" and only consisted of crumbs. In plastic coat was a little hole and it penetrated water. He could still swim because the float is filled with Styrofoam.
