4-30 cm x 1 columns and a rheodyne valve chamber temperature uniformity is ± 0.5 ... out and down from the top all columns valves and fittings are mounted on the door ... it has drains in the door for the valve and in the chamber floor for spills the ... audible alarm and user settable auto-off that will shutoff the chiller/heater ... 2.25 kg it is powered by a 12vdc power supply that operates from 100 to 260vac 50/ ... centrifuge tubes 12 vdc bench top power supply that takes ac inputs from 100 to 260vac ...