After tubes from the Rapid Digestor have cooled, dilution water is added and the tube is placed in the spring loaded retainer. Sodium hydroxide solution is added by means of a built in manual dispenser and the control selector is moved to the steam position. Distillation timer switch is an infinitely adjustable 0-15 minute timer that controls dispensing of steam into the digestion tube. Each distillation takes 5-10 minutes. Overall: 29-3/4H x 18W x 12-3/4"D. For 110V, 60Hz, 15 A. (65200)