1.fixed position accuracy--between aluminum plate and stainless steel plate have fixed position ear 2.marked clearly--the mark for specification 3.fixed position accuracy--between aluminum plate and stainless steel plate have fixed position point 4.fixed position accuracy--between aluminum plate and stainless steel plate have fixed position line 5.marked clearly--the mark for logo and production date 6.flat and cleaning for temperature-sensing position--processes:the leveling and sand blasting 7.careful polishing--to polishing surface of stainless steel 8.high quality brazing--over 95% area is brazing between stainless steel and aluminum plate