The smallest of the Orbit™ Digital Shakers, the P4 feature variable speed across a broad range, making them useful for a variety of applications. Both time of operation and shaker speed are set and displayed digitally, with their values shown on the large 3 digit LED. Parameters are selected with an easy turn knob. A sturdy base encloses the motor for quiet, vibration free operation. All three models can be used in temperature controlled environments. Their compact size makes it ideal for incubator use. Large capacity - process 4 microplates Resuspending, homogenizing, mixing or vortexing Sturdy, compact construction Suitable for cold room or incubator use Process up to 4 Microplates at a Time! The Orbit P4 vortexers accept all sizes of standard microplates, including deep well plates. Retaining springs on the contoured steel platform hold samples in place. Product Info Product Specifications Speed range* 100 - 1,200 rpm Timer 0 - 99 min or continuous Motion/orbit size Circular, 3 mm Maximum capacity P4: 4 microplates Maximum load 0.66 lb/0.3 kg Ambient operating range +4° to 65°C Base dimensions (W x D x H) 6.6 x 11 x 6 in/16.8 x 27.9 x 15.3 cm Weight 9.5 lb/4.3 kg Electrical 230V~, 50 Hz or 120V~, 60 Hz *Maximum speed for 115V unit is 1,400rpm