Ace photochemical reactor turntable for the determination of relative and absolute quantum yields. Variable height disc holds 13mm OD sample tubes, 33 in outer circle, 18 inner. Unit will hold up to four 7891 series square filters. Complete unit includes motor and control, CE rated. Not included: 7825-34 450w UV lamp, 7860 power supply (not rated), 7874 (-23,-26) quartz or 7875 (-30,-35) immersion well, 7891 series filters and either 8683-08 quartz or 8686-09 pyrex sample tubes.