Mller sc 88 pro switching computer muller sc 8820 pro the muller sc8820pro series is a din rail timer that has a text based menu navigation and self explanatory symbols the large and clear display with two high resolution text lines is easy to use for fast and intuitive programming this timer can be programmed without mains connection up to 10 years on its own power reservethe timer can be set for both daily and weekly programs other settings include holiday program mode timer mode i