PTC-225 Tetrad PCR (polymerase chain reation) thermal cycler with four alpha units and power supply, made by MJ Research, Inc., Waltham, Massachusetts in 1995. Used to amplify DNA, this machine is of the sort supplied to The Sanger Centre in Cambridge, UK, for their work on sequencing the Human Genome. PTC-225 Tetrad thermal cycler with four alpha unit 1995
