Scienceware^® heavy-duty test-tube rack

Scienceware^® heavy-duty test-tube rack, Holds 32 x 16-20 mm tubes

Scienceware^® heavy-duty test-tube rack, Holds 50 x 13-16 mm tubes

Scienceware^® heavy-duty test-tube rack, Holds 72 x 10-13 mm tubes

Scienceware^® heavy-duty test-tube rack, Holds 15 x 27-30 mm tubes