LabTek Rectangular Muffle Furnace Maximum Temp. 950 deg. C working Temp. 1200 deg. C A. 100 x 100 x 225mm. (4" x 4" x 9") B. 150 x 150 x 300mm. (5" x 5" x10") C. 150 x 150 x 300mm (6" x 6" x 12") D. 200 x 200 x 300mm (8" x 8" x 12")