Ample Scientific F-33D is one of the economically priced benchtop laboratory test tube centrifuge that can spin 8x (5-15ml) test tubes at a variable maximum speed of 550-3300rpm. The Champion F-33D Digital Centrifuge with enclosed inner tub and large opening is easy to clean and is perfect for sampling blood or other fluids. Quiet operation is ideal for general wet lab and physician's office. Unique vortex ventilation system keeps centrifuge chamber cool to protect analyte. Unit operates at less than 65dB, with variable speed up 3300 rpm (Rcf:1350 xg). Construct is industrial ABS with manual lock on right side of unit. Analog timer provides up to 30 minute of continuous operation. Other features includes low maintenance brushless motor, and auto stop system to discontinue acceleration as soon as lid is unlocked for safety. Unit comes with one set (8) of 15ml holders on 45 degree angled PC rotor and one set (8) of 13x75mm small tube inserts