Item description from the seller

110V 4 Tubes Blood Mixer Roller Mixer Spin for Mixing Blood

The ROLLER MIXER has the rolling and vibrating speed which is adjustable.
The machine has a reasonable vibrating range and an inter zone crashing range that is adjustable.
It can help the blood fully mixed in anticoagulant bottle (tube) which is suitable for dried powder and freeze dried agent mixing as well as liquid mixing in sealed bottle (tube)

Specifications:

Roller Size: 4 Nos. x 230mm Length
Main input:110V AC,60Hz
RPM: 30 R.P.M/36.RPM
Mixing Time :15 to 20 minutes
Weight:2.50 Kg
Capacity : Net VAcationer 6 Nos (of 4ml) or Bulb of 5mlx15 Nos.