These programmable mechanical convection ovens provide excellent uniformity, autotune, calibration offset, and zero-span calibration. Easy operation features include quick auto-stop, auto-stop, auto-start, and programmed auto-start. Program up to 30 steps (a combination of set temperature and set time) for your operation. Self-diagnostic functions alert you both visually and audibly if sensor or heater malfunctions; heater circuit automatically turns off. Specially designed large push-button door handle ensures smooth, stress-free opening and closing of oven door. Add an external temperature probe using the 33 mm dia cable port.