LAB-BOX Professional Lid (Built-in Timer/Thermometer)LAB BOX Professional Lid is a special accessory with a built in Timer and Thermometer. It is a professional alternative to the standard lid. The Lid has a stainless steel probe which can measure the liquitd temperature inside the tank during the process, to control and check the developing. Especially useful for procesess like the color negative C 41 which need a special attention to the temperature. DOWNLOAD USER MANUAL Since the liquid can be poured