The Benchmark Scientific BV1003-E BenchMixer V2 Vortex Mixer utilizes a smooth and powerful mixing technology similar to the original BenchMixer, with the advantage of a uniquely designed reversible rubber head that can be attached to the mixer in two orientations. For the vortexing of single tubes, the cupped surface would generally be preferred. However, for applications requiring a flat/dimpled surface for mixing uniquely shaped vessels (or a handful of multiple test-tubes), the head can easily be flipped over and reattached in reverse orientation. Like the original BenchMixer, the drive system is balanced with Q-Drive technology, providing a smooth vortexing action, while minimizing noise and excessive vibration. This results in quieter, more efficient and longer lasting operation. With a maximum speed up to 3200 rpm, the mixer provides an instant vortex of even the largest sample sizes, including full 50ml tubes.