Roller Mixers
Roller mixers turn tubes and bottles on a set of rollers rather than shaking them, the gentlest form of mixing in Labman’s shaker range. The Edmund Buhler RM 2 handles any tube or vessel up to 80 mm in diameter on 6 removable rollers, with an optional overhead rack that converts the same unit to vertical rotation mixing. It suits applications where even a slow rocking motion generates too much foam or agitation.
- Rotating Speed: 5-35 rpm
- Rocking Speed: not specified
- Motion: Rotate
- Capacity: 2.25 kg
- Control: Analog
€1.035,00 excl. VAT
- Rotating Speed: 1-35 rpm
- Rocking Speed: 1-70 rpm
- Motion: Rock, Rotate, Timed auto-switch
- Capacity: 4.5 kg
- Control: Touch Control, LCD
€2.000,00 excl. VAT
- Rotating Speed: 5-35 rpm
- Rocking Speed: 10-70 rpm
- Motion: Rock, Rotate, Orbital (with attachments)
- Capacity: 4.5 kg
- Control: Analog
€1.450,00 excl. VAT
- Motion: rotating and tilting motion
- Shaking platform: 200 x 300 mm
- Max. load: 2 kg
- Shaking speed: 5 – 80 rpm, in steps of 5
- Angle of tilt: 3° fixed
€2.373,00 excl. VAT
| Configuration | Motion | Speed Range | Vessel Size | Best For |
|---|---|---|---|---|
| RM 2, standard rollers | Rolling with 3-degree tilt | 5-80 rpm | Tubes and vessels up to 80 mm diameter | Blood tubes, general foam-free resuspension |
| RM 2, with optional overhead rack | Vertical rotation (overhead) | 5-80 rpm | 12-hole rack, Ø29.5 mm | Protocols specifically calling for overhead mixing |
Rolling versus shaking
A roller mixer does not shake the sample at all. Instead, tubes or bottles rest on a set of rotating rollers and turn continuously, combined with a slight tilt, which resuspends contents without the foam or shear that even a gentle rocking or shaking motion can introduce. This makes it the preferred choice for applications where foam formation specifically needs to be avoided, such as blood tube mixing.
The Buhler RM 2
The Buhler RM 2 is fitted with 6 removable plastic rollers, each 300 mm long and 32 mm in diameter, that accept any standard tube, flask, or vessel up to 80 mm in diameter. Speed runs from 5 to 80 rpm, with a fixed 3-degree tilt, and a removable spill tray underneath makes cleaning easy after any spillage. An optional overhead rack, fitted with 12 holes, turns the same unit into a vertical rotation (overhead) mixing system for applications that call for that motion instead.
Who chooses a roller mixer
This category suits hematology labs mixing blood tubes, cell culture work sensitive to foam formation, and any application needing the gentlest possible resuspension without shear. It is a common companion to orbital or reciprocating shakers already used for general flask work, added specifically for the subset of samples that need rolling rather than shaking.
Related shaker categories
For general flask culture and mixing, see our orbital shakers or reciprocating shakers. For samples sensitive to shear or foam that still need some shaking motion, see our rocking, tilting, and 3D shakers. If your shaker needs to fit inside an incubator or fridge, see our CO2-incubator and miniature shakers, and for dedicated microplate work, see our microplate shakers. For larger sample loads, see our multi-flask and heavy-duty shakers. For an overview of the full range, see our laboratory shakers category. If your workflow also needs quick tube mixing, see our laboratory vortex mixers, or for combined shaking and incubation in one unit, see our shaking incubators.