General Laboratory application Max. 250?, ±1.0 ? accuracy, ±2.0 ? uniformity. Digital PID Controller enables 0.1? resolution. Equipped with wait-off timer, alarm, auto-tuning and in built temperature calibration function. Modern Design Seamless round cornered edge of chamber prevents leakage and easy to clean. Perfect Safety Durable non-contact type switch and relay cut-off heater to protect hot air rush to outside when door open. Dual over-temperature protection safety and electrical leakage breaker