its two tier arrangement has 11 troughs and a blank station in the upper tier and 12 trough stations in the lower tier. A simple switching system facilities the use of this machine in 3 modes.As one unit utilizing all the 23 staining station in series.As two independent staining machines working at the same time and programmed separately (independent grouping)As two staining machines operating simultaneously with the same time staining cycle (parallel grouping). Supplied with staining troughs 23 nos slide carrier 2 nos calibrated timing discs 1hr. 6 nos complete with one plier for programming and dust cover.operated through a feather touch keypad with digital display for adjusting the time sequence to use the machine in following style:As one unit utilizing all the 23 staining station in series.As two independent staining machine working at the same time and programmed separately (independent groping).As two staining machines operating simultaneously with same time staining cycle (Parallel grouping).Supplied with staining troughs 23 nos, slide carrier 2 nos, and a dust cover.