Each 3-stage digital programmable model has 2 standard muffle sizes, a 3-series controller, 9 multistage programs, a hold-temperature program, and a delay-start option, which allows a program’s start time to be delayed for up to 7 days. Unit is constructed with a heavy-gauge steel cabinet and is finished with a durable, baked-enamel coating. Vertical lift door directs heat away from the operator and is standard for safety and space conservation.