Natural air convection method and gentle air circulation provide excellent temperature homogeneity. Glass observation window with air tight lock and silicon rubber sealing prevents unwanted loss of heat. Stainless steel interiors with heating elements on all six sides provide uniform heating even if load is high. This series is designed to reduce sample contamination and provide a stable environment for growth and maintenance of cell cultures. - Stainless steel inner chamber with semicircular transition and adjustable shelves - Easy to use interface - LCD display with multiple displays of data and timer function - Door having tempered glass observation window with adjustable air-tight lock