mpo55Melting Point System MP55 Simple and Versatile. The MP55 is the ideal starter model and offers simultaneous determination of up to 3 melting pointmelting range or 2 slip melting pointMelting Point System MP55 Simple and Versatile. The MP55 is the ideal starter model and offers simultaneous determination of up to 3 melting pointmelting range or 2 slip melting point