Designed for long-term storage and easy sample retrieval. Indexed rack and box system allows you to find the sample needed quickly and efficiently. Compact size stores up to 3600 samples. A unique hanging rack and gridded box design allows tracking and easy retrieval of samples. The Locator 8 uses a 5-by-5 array for 2.0 ml vials. The Thermolyne advanced vacuum system minimizes liquid nitrogen evaporation, and advanced insulation assures all samples are stored below -180ï¿½C even when less than 2" (5 cm) of liquid nitrogen remains in the vessel. An optional liquid nitrogen level monitor safeguards your valuable samples (see explanation following).