... Hotplate,Melting Point Device,SamplerConcentration,Block Heater,Vortex Mixer,Cold Keeper,Mixer Incubator, Rocker, Shaker, Roller Mixer, PCR,etc.Application: ... , turn it on, and put the sample in, the Cold Keeper can keep your sample at low temperatures for long periods. No ... of the compartments when you need different sizes. The unit can also use the ceramic-coated aluminum beads to accommodate various ...