Centrifuge Model 642M Accessories 642M Car Seat $60.00 Shield Cap, Pack of 6 $89.78 Red Tube Holder, 100 mm, Pack of 6 $135.82 Universal Blue Tube Holder, 75 to 100 mm, Pack of 6 $135.82 Green Tube Holder, 75 mm, Pack of 6 $144.95 Travel Case for 6 Tube Centrifuges $528.39