A 135L laboratory oven features precise temperature control via microprocessor PID, a range from ambient temperature up to 300°C, and a stainless steel chamber with corrosion resistance and easy cleaning. It includes user-friendly digital displays, timers for operations up to 99 hours, and various safety mechanisms like over-temperature protection and controller locks to prevent malfunctions. Features also vary by model, with some offering natural or forced air convection for uniform heating, while others include options for data logging, stacking, and HEPA filtration.