Whether fluid or viscous, the overhead stirrer proves itself with even mixing results The overhead stirrer from Steinberg Systems is ideal for mixing liquids in the lab or workshop. The lab overhead stirrer can easily handle stirring for long periods of time and mixing viscous liquids. It is easy to use and to adjust to your needs. The overhead stirrer produces just the right mix With a minimum deviation of just ± 1 rpm at a stirring speed of 100 to 2,500 rpm, the lab mixer can be optimally adjusted for any substance. You can precisely set even long stirring processes between 0 and 9,999 minutes using the timer. This is the ideal laboratory mixer for up to 20 L of thin or viscous liquid. The overhead mixer's powder-coated steel design is both simple and effective. The large, sturdy 20 x.