Blue Sea 1820 VSM 422 Battery Temperature SensorVSM 422 Battery Temperature Sensor For use with the Vessel Systems Monitor VSM 422 Corrosion resistant Fully sealed Compact WARNING: This product can expose you to chemicals including di(2 ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov. Whether you are a professional or a person who likes to cruise, you can make the most of