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9-Roller Digital Tube Mixer with Variable Speed, 120V - 60Hz Features: Rocking and rolling action for complete mixing Nine roller model for high throughput Designed for continuous quiet operation Can be used in cold rooms or in incubators This roller mixer provide a gentle, but highly efficient, rocking and rolling action. These advanced digital models offer variable speed from 5 to 60rpm and a built-in digital timer which can either set from 1 second to 90 minutes, 1 minute to 9 hours or in minutes only mode up to 9999 minutes for maximum versatility. Recommended for mixing blood samples, viscous substances and liquid-solid suspensions where minimum aeration is required. Units can be used in incubators up to 60 C and humidity up to 80%, or in cold rooms down to 4 C. Mixers are robustly constructed and designed for easy cleaning, having plastic rollers and a drip tray to collect accidental spillages. Most sizes of tubes, Bijoux, Universals and bottles can be accommodated, up to 100mm diameter.