Home / Primary Temperature MetrologyPOND ENGINEERING OFFERS FULL ITS-90 REALIZATION CAPABILITY - FROM ARGON THROUGH SILVER Theory & Background Theory & Background DEFINING FIXED POINTS K52 Argon Triple Point Cell & Maintenance System K38 Argon Triple Point Cell & Maintenance System K29D Water Triple Point Cell Maintenance System K29A/B Triple Point of Water Cells K29H Triple Point of Water Cell K28 Gallium Melting Point Cell & Maintenance System K23 PrimaryMetrology Furnaces K23 Primary MetalFreeze Point Cells PRIMARY COMPARISON SYSTEMS K22 Comparison Cryostat K12 Comparison Furnace