Suitable for 12*1.8/2.0ml cryovials blue. For application requiring rapid and repeatable cooling in the laboratory, for sample set-up, protection, transport, and storage of sensitive samples. Preventing enzyme inactivation during sample transfer. Dry incubation design reduce the risk of sample contamination. An entire 96-well PCR plate can be kept at 0℃ for at least an hour after 2 hours of pre-cooling at -20℃. Specially designed well shape avoids sample frozen. Temperature-sensing indicator gives clear identification by color change when temperature exceeds 7℃(from purple to pink gradually). Stackable to save space.