Double Walled – Inner SS – Outer GI – 3″ Gap Puf/Glass Wool Insulation; Full length inner glass or acrylic door for clear inner view – Outer metal door with Magnetic Gasket & Lock. Forced air circulation for uniform temperature throughout the chamber. Dual preset electronic Digital Temperature Controller Cum Indicator. Temperature Range : 5°C above ambient to 60°C ± 1°C Humidity Range from atmospheric humidity to 90% Rh Controlled by Digital Display Controller (Direct RH Indicator) ± 3% Rh.(The old system of wet and dry bulb temp. indicator is now obslote)