High performance muffle furnace with a microprocessor-controlled thermo-regulator characterized by excellent repeatability and features temperature resistant paint. High accuracy controller for better operability and visibility. Excellent heat tightness with a firmly sealed chamber door. High temperature accuracy at ±1.0°C. Upgraded with long life R-thermocouple sensors. High quality alumina porcelain hot plate where heater is not exposed to the inner chamber preventing contamination of samples. Program operation of maximum 99 steps, 99 patterns, with repeat operation function. Safety features include self-diagnostic functions, calibration off-set, key lock function, auto recovery after power failure, earth leakage breaker, automatic overheat prevention device and independent overheat prevention device. Optional items include exhaust system, N2 gas loading device (with flow meter), temperature output terminal, time-up output terminal, sample tray, external communication terminal (RS232C), external communication adapter, event output terminal, operation signal output terminal and furnace floor plate. Temperature range 100°C or 1150°C.