Detailed Product Description features: 1.both interior and exterior made of non-eroting stainless for easy cleaning. 2.the space between the shelves in chamber is adjustable. 3.auto -check of fan speed to prevent damage to the samples 4.self-check function easy to identify problem, 5.over temperature and temperature diffence alarm. 6.independen audiable and visible temperature-limiting alarm system ensures experiments run safely.(option) 7.programmable controller:15 periods 30 step.1to 99hs mins for each periods ,fan speed 0 to 100% adjustable. 8.RS485connector can connect computer and printer to record the parameters and the variations of temperature. Specifications Model JK-HIL-9052 JK-HIL-9082 JK-HIL-9162 JK-HIL-9272 Electrical Requirement 220V 50HZ Temperature Range RT+5~65â?? Display Resolution 0.1â?? Temperature Stability ±0.3â?? Ambient Temperature +5~40â?? Power Consumption 250W 350W 550W 750W Interior Dimension (WÃ?DÃ?H,mm) 350Ã?320Ã?350 400Ã?400Ã?500 500Ã?370Ã?800 520Ã?460Ã?1050 Shelves 2(pcs) 3(pcs) Timing Range 1~9999min