Comparison : Item # 3121-04, Evaporative, Kuderna-Danish, with Graduated Concentrator Tube, 250mL Flask Capacity, 10mL Tube Capacity, 0-1 x 0.1mL Tube Graduations x 2-10 x 1mL Subdiv., 560mm Overall Height
Item # 3121-06, Evaporative, Kuderna-Danish, with Graduated Concentrator Tube, 500mL Flask Capacity, 10mL Tube Capacity, 0-1 x 0.1mL Tube Graduations x 2-10 x 1mL Subdiv., 600mm Overall Height