Vertical air circulation system produces faster temperature response rates and ensures temperature uniformity. Microprocessor PID controls deliver fast ramping rate and ensures stability during the operation. - Microcomputer PID intelligent temperature controller with LCD display - Air blower-heater and vertical hot air circulation system ensures temperature uniformity - Stainless steel inner chamber with cold rolling steel electrostatic spraying exterior - Adjustable air-tight buckle lock and silicone rubber seal ensures tight sealing and prevents heat loss