HC34 or TW34 Cryo-Sentry Level Alarm

Cryo-Sentry Level Alarm for HC34 or TW34. To protect valuable biological samples this alarm will sound promptly to alert you when more liquid nitrogen is needed. It is best suited for the infrequently used refrigerators and is recommended for stored product protection. It is equipped for battery operation. For use with HC34 or TW34.