Analogue water bath with round tank 2206 27 1 Grades 371 and 373 are Unit:250 Grades 371 and 373 are specially treated hardened ashless papers ideal for critical quantitative analysis techniques requiring increased we strength and handling capacity ultrasonically welded (filter with membrane Ø 13 mm) or injection moulded (filter with membrane Ø 25 mm) The external housing is made from a strong sheet of 18 8 stainless steel whilst insulation between the housing and the tanks is provided by fiberglass The molded inner tank made from one single piece of 18 08 stainless steel without seams or seals to ensure perfect heat distribution and eliminate leaks