A high-temperature cell has been developed in which a weak salt such as NaCl is used as a pressure medium. This cell exhibits extremely low friction. The behavior of the cell was studied in detail by observing the melting temperature of metals by dta over the range 10--60 kbar and 300¿--1400¿C. Melting temperatures determined on compression and decompression strokes coincide. Friction corrections are eliminated. Transition pressures determined in this cell agree with those determined in gas apparatus over the range of overlap. Comparison with other cells indicates systematic overestimation of pressure in the other dta cells studied. Applicability to geologic phase studies is discussed. Over the range 10--60 kbar the precision of pressure determination in this cell is ¿ (0.3-0.5) kbar. Absolute accuracy is estimated to be ¿ (1%+0.5) kbar.