XT Starter is a stationary device designed for maintaining sample temperatures below 4°C on the bench top without the use of wet ice, batteries or electricity. Patent-pending dual-phase conductive XT Cooling Core provides the cooling source when a thermo-conductive CoolRack or CoolSink tube or plate module is placed on top. The core and sample module in combination ensure uniform well-to-well temperature throughout the cooling period regardless of sample position. XT Starter can maintain sample temperature from 0.5 to 4oC for over 4 hours.