Timer allows monitoring of the first through fourth slide racks when used with the StatLab High Capacity Slide Dryer (SI-SDR-HC), sold separately. Ensures that each slide rack has exactly the correct time in the drying chamber, indicates visually and audibly when an individual slide rack has completed drying. Intended for use with the StatLab High Capacity Slide Dryer (SI-SDR-HC), sold separately. Additional timer (SI-SDR-TMR2) available for maximum capacity.