Portable Demineralizer for Laboratory is provided with three polyvinyl chloride columns of which one contains cation exchange resin, another of anion exchange resin and the third column of buffer maintains pH of demineralised water. The Demineralizer is available in a sturdy construction that ensures optimum performance for longer period of time. The Demineralizer can be installed in less amount of space and is suitable for laboratory. Portable Demineralizer for Laboratory is designed with a laminated cabinet that is fitted with carry belt.