These 12 VDC portable shake-out machines have a rugged steel outer case. All models have a variable speed motor with tachometer. Heated models are double insulated to prevent heat loss. P2435-1 and P2435-2 have two pre-heated pockets for fast sample heat-up. P2435-1 and P2435-2 have a two-place trunnion head (4-place is available as a special order) that accepts short cone, 100mL oil centrifuge tubes. P2435-3 thru P2435-14 are unheated. Select a model that will accept 100mL short cone or pear shaped oil centrifuge tubes as well as 12.5mL finger tubes.