The Roto-Mini™ Plus from Benchmark Scientific is a compact, economical tube rotator with a wide range of mixing capabilities. 

• Includes holders for tubes from 0.5ml to 50ml
• Optional holder for PCR plates
• Adjustable speed, 5-70rpm with digital setting
• Vertical (end over end) or horizontal (rolling or hybridization style) mixing
• Four modes of operation
  • Rotate
  • Mix - rotating combined with periodic oscillation
  • Pause - rotating with periodic pausing
  • Rock - back and forth see-saw motion (optional rocking platform available)

https://www.wisbiomed.com/content/roto-mini-tube-rotating-mixer-variable-speed-bs-r2024-0